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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 > Vishnu Catted DP vs AR Catted DP



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      05-23-2012, 03:32 AM   #1
RedmangoHTX
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Vishnu Catted DP vs AR Catted DP

Hey all,

I'm new to the forum, so hopefully you guys will see more of me around soon. I currently have the BMS downpipe, but that darn catless smell annoys my whole family lol. I'm looking into maybe purchasing one of those catted options. Anyone have either one and care to give their input on what they think of it?

Thanks!
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      05-23-2012, 04:30 AM   #2
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Hello and welcome

Maybe you want to use the button before you post something...

However, your question is interesting and hope you will have a lot of answers
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      05-23-2012, 09:28 AM   #3
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Might as well stay with the stock dp
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      05-23-2012, 10:19 AM   #4
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Don't mean to jack redman's thread, but is there "absolutely no" value in installing a "catted" aftermarket DP, vice staying stock?
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      05-23-2012, 10:23 AM   #5
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Quote:
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Don't mean to jack redman's thread, but is there "absolutely no" value in installing a "catted" aftermarket DP, vice staying stock?
Ofcourse! But the gain of HP will be a lot less! So the balance price/work to performance is a bit off...
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      05-23-2012, 10:33 AM   #6
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Gains from catted are about half the gains from cat less. The ar design DPs use high flow cats so there is still a big advantage getting them over stock, but of course not as much as if going cat less.

Mike
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      05-23-2012, 12:59 PM   #7
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Quote:
Originally Posted by BMW_Belgier View Post
Ofcourse! But the gain of HP will be a lot less! So the balance price/work to performance is a bit off...
Quote:
Originally Posted by Mike@N54Tuning.com View Post
Gains from catted are about half the gains from cat less. The ar design DPs use high flow cats so there is still a big advantage getting them over stock, but of course not as much as if going cat less.

Mike
Understood, and thanks for the response(s).
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      05-23-2012, 01:07 PM   #8
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just throw some cats on your mid pipes!
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      05-23-2012, 02:20 PM   #9
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The X-Drive models have catted midpipes if you want OEM
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      05-23-2012, 03:43 PM   #10
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I'm not too concerned with losing a couple HP. I however love the sound that the catless Dp has unleashed. I feel like as long as my car is relatively quick (able to run map 2), the comfort level (smell) is high, and the sound upgrade is still there all will
Be good.
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      05-23-2012, 03:48 PM   #11
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I guess another way to put it is... How much will going with a catted Dp plus map 2 yield (Hp wise) me versus going to stock Dp and running map 1?
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      05-23-2012, 05:13 PM   #12
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Quote:
Originally Posted by RedmangoHTX View Post
I guess another way to put it is... How much will going with a catted Dp plus map 2 yield (Hp wise) me versus going to stock Dp and running map 1?
umm you can still go map 2 with the stock dp. You just need the right octane to be able to support it.!
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      05-23-2012, 07:17 PM   #13
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I would go for the catted midpipes and cattless dp...

Its a shame that i can't drive here with cattless dp...
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      05-23-2012, 07:53 PM   #14
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Everyone on this forum is so one minded. The guy gets it Catless is better than Catted obviously. But he cares more about the stinky smell than the HP he's getting out of the Catless DP.

I would honestly like to go down this route as well because I wouldn't want my 50K BMW to smell like shit either. But at the same time, I'd like a high flow DP so I can run MAP 2 without using NOS octane booster, which I heard makes your engine yellow.

Is there anyone running a catted DP that can provide us with some info?
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      05-23-2012, 08:43 PM   #15
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What specific info are you looking for? Don't have any before/after dyno numbers (just after) but can provide some insight from the daily driver perspective.

The catted AR downpipe plus JB4 map 2 sounds great, performs well, and doesn't give the smell nearly as badly as the catless variant. If you're in a garage with the windows down and stopped you might smell a little bit, or the car behind you might smell a bit when you're running rich... but again as long as you're not looking for the full power and just want the sound, smell and ability to run map2 it's definitely worth it. Running AR catted + vanguard exhaust the car sounds like a beast.
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      05-23-2012, 09:52 PM   #16
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I just bought iCarbon catted dps but i havent installed them yet... I really dont wat my car to smell like crap also my friend has catless and his car is always dirty in the back... Is there really such a big difference in HP gain between catted and catless?
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      05-24-2012, 02:04 AM   #17
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Quote:
Originally Posted by torqnDC View Post
What specific info are you looking for? Don't have any before/after dyno numbers (just after) but can provide some insight from the daily driver perspective.

The catted AR downpipe plus JB4 map 2 sounds great, performs well, and doesn't give the smell nearly as badly as the catless variant. If you're in a garage with the windows down and stopped you might smell a little bit, or the car behind you might smell a bit when you're running rich... but again as long as you're not looking for the full power and just want the sound, smell and ability to run map2 it's definitely worth it. Running AR catted + vanguard exhaust the car sounds like a beast.
Thanks. That's pretty much what I was looking for. What were your dyno numbers? So smell-wise, windows down @ a stoplight.. would you smell it? That's like the biggest thing for me lol. I don't know how it doesn't bother lots of you guys. Everyone seems to notice mine.
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      05-24-2012, 07:02 AM   #18
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No, ordinarily with the windows down at a stoplight you won't smell it. If there's a strong wind from the rear of the car you might smell a bit, but even so it's not very noticeable. It's the car behind you when you get on the gas in the low RPM range that will smell a bit, haha.

305HP/355Ft-lbs on a DynoDynamics, which I'm told would read equivalent to 345HP/403Ft-lbs on a DynoJet.
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      05-24-2012, 07:26 AM   #19
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Catted mid pipes would be my choice...(good info again!)
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      05-24-2012, 08:21 AM   #20
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Yes catted midpipes

I would however organize steel cats (dont know how to call them in english) so you dont burn them out without pre-catted dps
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      05-24-2012, 08:45 AM   #21
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Quote:
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No, ordinarily with the windows down at a stoplight you won't smell it. If there's a strong wind from the rear of the car you might smell a bit, but even so it's not very noticeable. It's the car behind you when you get on the gas in the low RPM range that will smell a bit, haha.

305HP/355Ft-lbs on a DynoDynamics, which I'm told would read equivalent to 345HP/403Ft-lbs on a DynoJet.
That's good. So it's like farting on their face... Awesome lol
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      05-25-2012, 07:37 PM   #22
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i have an AR catless dp, definitely recommend it. Even though your going catted, i'd say AR!
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