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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > RSi Downpipe- most powerful bolt-on for N55



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      12-02-2011, 09:01 AM   #1
bryce
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RSi Downpipe- most powerful bolt-on for N55

you n55 Owners should check out this downpipe. it's got the highest gains of all the n55 downpipes. rather than splitting the single turbo downpipe into 2 sections like stock and all aftermarket downpipes, it's just a single downpipe. will require custom single midpipe but the gains are worth it!







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      12-02-2011, 11:42 AM   #2
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Now that's what I've been trying to preach for how long now????? Thank god somebody did it
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      12-02-2011, 11:45 AM   #3
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hmm looks pretty good. link no work. How much? why do u say its most powerful
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      12-02-2011, 12:17 PM   #4
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go to www.rsituning.com, they currently have the pre-order up for the f10 535i. this is hands down the best downpipe for the n55. custom midpipe should be no problem for any exhaust shop

Last edited by bryce; 12-04-2011 at 07:57 PM.
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      12-02-2011, 12:19 PM   #5
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here's the dyno, completely stock car w/ just the downpipe and midpipe (no tune, stock boost):

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      12-02-2011, 12:21 PM   #6
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here's the dyno, completely stock car w/ just the downpipe and midpipe (no tune, stock boost):

They should just make a full exhaust then geezzz
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      12-02-2011, 12:36 PM   #7
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I have been trying to preach this type of a DP forever now as well... Best DP you can have is a single!
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      12-02-2011, 12:51 PM   #8
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$600 for the downpipe, plus labor to install the downpipe, which Ive seen range from free to almost $250 or so for some people. Now, on top of that, you have to pay someone to cut your exhaust and weld some pipe back on. You lose if you want to ever go back to stock, unless you want to pay again, and even for that small amount of work. The labor plus any clamps and pipe they have to use will probably run another 200 on top of what it cost to install the downpipe itself. So now you are close to 1000 dollars for a downpipe and a you get an extra 10hp and maybe 20tq over the 370 dollar BMS pipe? This is very good gains, but you can see from the picture it is not a stock 135. They have replaced the midpipe resonators/cats and its basically a turbo back exhaust with the stock muffler.

Me personally, I cant justify the extra almost 500 for just 10hp and 20tq. Its is a very good design though. Hopefully BMS can do something with this and make it in to 400whp. Terry needs to put his FMIC on and then this pipe and I bet he will be very close if not there!
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      12-02-2011, 01:05 PM   #9
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I am not one to complain about prices.

But $600 for that pipe is a joke, period.
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      12-02-2011, 01:08 PM   #10
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Quote:
Originally Posted by Abear View Post
$600 for the downpipe, plus labor to install the downpipe, which Ive seen range from free to almost $250 or so for some people. Now, on top of that, you have to pay someone to cut your exhaust and weld some pipe back on. You lose if you want to ever go back to stock, unless you want to pay again, and even for that small amount of work. The labor plus any clamps and pipe they have to use will probably run another 200 on top of what it cost to install the downpipe itself. So now you are close to 1000 dollars for a downpipe and a you get an extra 10hp and maybe 20tq over the 370 dollar BMS pipe? This is very good gains, but you can see from the picture it is not a stock 135. They have replaced the midpipe resonators/cats and its basically a turbo back exhaust with the stock muffler.

Me personally, I cant justify the extra almost 500 for just 10hp and 20tq. Its is a very good design though. Hopefully BMS can do something with this and make it in to 400whp. Terry needs to put his FMIC on and then this pipe and I bet he will be very close if not there!
Everything you said is very true! But you forget this is without a tune!!! Then if it was me, I wouldn't buy this unless it comes with a full exhaust like I said before. That way if you ever need to go back to stock then it's entirely possible.
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      12-02-2011, 01:23 PM   #11
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600 bux for a pipe is robbery... I won't buy this at that price...wow
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      12-02-2011, 01:30 PM   #12
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it's only 10whp/20tq on boost levels. up the boost and the gains over the bms, ar design, or other downpipe could increase significantly.

$600 is a little high, but for the innovative design it's fair IMO, it's the same or less than the price as the ar design pipe, but yields better power.
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      12-02-2011, 01:34 PM   #13
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Quote:
Originally Posted by Abear View Post
$600 for the downpipe, plus labor to install the downpipe, which Ive seen range from free to almost $250 or so for some people. Now, on top of that, you have to pay someone to cut your exhaust and weld some pipe back on. You lose if you want to ever go back to stock, unless you want to pay again, and even for that small amount of work. The labor plus any clamps and pipe they have to use will probably run another 200 on top of what it cost to install the downpipe itself. So now you are close to 1000 dollars for a downpipe and a you get an extra 10hp and maybe 20tq over the 370 dollar BMS pipe? This is very good gains, but you can see from the picture it is not a stock 135. They have replaced the midpipe resonators/cats and its basically a turbo back exhaust with the stock muffler.

Me personally, I cant justify the extra almost 500 for just 10hp and 20tq. Its is a very good design though. Hopefully BMS can do something with this and make it in to 400whp. Terry needs to put his FMIC on and then this pipe and I bet he will be very close if not there!
N55 135i does not come with a resonator or 2nd cats from factory just like the n55 335i coupe. The only cat is on the dp.

The true comparison would be the RSi dp with full exhaust vs. one of the current aftermarket n55 dps with full exhaust.
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      12-02-2011, 01:34 PM   #14
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Everything you said is very true! But you forget this is without a tune!!! Then if it was me, I wouldn't buy this unless it comes with a full exhaust like I said before. That way if you ever need to go back to stock then it's entirely possible.
I realize that, and the Berk downpipe...which is also $599, but bolts directly with no modification to the exhaust, makes 20hp and 30tq at the wheels.

If you notice in the picture, this 135i that they are claiming is stock, has a complete midpipe. So unless people are planning on getting a complete midpipe, I dont think they will see the 55tq they are claiming. If you go to the RSI website, they already offer a pipe for the F10 535s, and it only makes 20-30tq.
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      12-02-2011, 01:34 PM   #15
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I'm curious the actual theory behind this... if you don't split the downpipe, you'll have to split the midpipe... it's the same amount of restriction, just further down the exhaust stream (unless you only use a single inlet, single muffler exhaust).

Also, the $600 that everyone else charges for downpipe lies in the huge pain in the ass it is to merge 3-4" pipe into two 2.5" pipes. This downpipe needs none of that fabrication, should DEFINITELY be significantly cheaper.... hell they didn't even weld a flange on the cold side.
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      12-02-2011, 01:42 PM   #16
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Quote:
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I'm curious the actual theory behind this... if you don't split the downpipe, you'll have to split the midpipe... it's the same amount of restriction, just further down the exhaust stream (unless you only use a single inlet, single muffler exhaust).

Also, the $600 that everyone else charges for downpipe lies in the huge pain in the ass it is to merge 3-4" pipe into two 2.5" pipes. This downpipe needs none of that fabrication, should DEFINITELY be significantly cheaper.... hell they didn't even weld a flange on the cold side.
My theory at least lies in the flow. If you split it early on, your redirecting and introducing obstacles close to an area where you want to get rid of hot gas as efficiently from the scroll as possible. You are also carrying one extra useless pipe that adds weight and friction. When you split it at the last possible moment then you give the gas some chance to cool down and flow more evenly. Just my 2c
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      12-02-2011, 01:47 PM   #17
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Quote:
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N55 135i does not come with a resonator or 2nd cats from factory just like the n55 335i coupe. The only cat is on the dp.

The true comparison would be the RSi dp with full exhaust vs. one of the current aftermarket n55 dps with full exhaust.
So the exhaust on a 135 doesnt look like this? If not, I take my statements back, but still, that pipe did not look like an OEM BMW pipe thats in that picture.





Also, any modification needed to the exhaust to make this fits kinda makes this pipe non-bolt on wouldnt you say?
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      12-02-2011, 02:03 PM   #18
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Quote:
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Quote:
Originally Posted by e92sport View Post
N55 135i does not come with a resonator or 2nd cats from factory just like the n55 335i coupe. The only cat is on the dp.

The true comparison would be the RSi dp with full exhaust vs. one of the current aftermarket n55 dps with full exhaust.
So the exhaust on a 135 doesnt look like this? If not, I take my statements back, but still, that pipe did not look like an OEM BMW pipe thats in that picture.





Also, any modification needed to the exhaust to make this fits kinda makes this pipe non-bolt on wouldnt you say?
I agree... That's not a stock exhaust
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      12-02-2011, 02:09 PM   #19
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Quote:
Originally Posted by Abear View Post
I realize that, and the Berk downpipe...which is also $599, but bolts directly with no modification to the exhaust, makes 20hp and 30tq at the wheels.

If you notice in the picture, this 135i that they are claiming is stock, has a complete midpipe. So unless people are planning on getting a complete midpipe, I dont think they will see the 55tq they are claiming. If you go to the RSI website, they already offer a pipe for the F10 535s, and it only makes 20-30tq.
It looks like an interesting idea! Can't beat the BMS N55 down pipe on bang for your buck though @ $369.



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      12-02-2011, 02:52 PM   #20
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the n55 135i doesn't have secondary cats, so that image is not correct. the n54 135i DOES have secondary cats, that's what that image is from
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      12-02-2011, 02:53 PM   #21
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Quote:
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So the exhaust on a 135 doesnt look like this? If not, I take my statements back, but still, that pipe did not look like an OEM BMW pipe thats in that picture.





Also, any modification needed to the exhaust to make this fits kinda makes this pipe non-bolt on wouldnt you say?
see post above
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      12-02-2011, 03:05 PM   #22
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Quote:
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the n55 135i doesn't have secondary cats, so that image is not correct. the n54 135i DOES have secondary cats, that's what that image is from
Yeah, I see that now, the 335I N55/N54 is the same way. N54 has secondary cats + resonator, and N55 has nothing.


Still, back to my point though, that exhaust in the picture with the blue car is not factory. This pipe that is claming to be bolt-on is not. When you have to cut and weld and clamp and whatever else, that is not bolt-on. I can see where all the power is coming from, they took all the drastic bends out of the stock daul setup from factory. Thats where the power is coming from, and the downpipe.

I realize the $600 dollar quote I said about the downpipe is just my speculation, I was just judging it from what their F10 pipe is. So I dont want to be the one to get flamed if its a little cheaper when it comes out .
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