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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 N55 Downpipe Review



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      02-23-2011, 01:38 PM   #1
htt760
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Vishnu N55 Downpipe Review

Vishnu 3.5 inch N55 Downpipe


This review is to help members gauge possible interest in a new product from Vishnu Tuning. This is going to be straight forward and right to the point (short and simple). The two companies I was debating on going with were AR’s 4 inch dp and icarbon’s 4 inch dp but chose The Vishnu 3.5 inch DP.

We have learned from these forums that the restriction on the N55 is in the stock catalytic converter, removing this item will free up the flow for more horsepower/torque no matter what. I personally chose Vishnu because I could not Pass on the Deal offered, it’s a 3.5 inch DP, and the product didn’t look bad at all, oh and Shiv's dyno results sealed the deal.
Anyways, we can add Vishnu to the N55 downpipe list with AR and icarbon as well now.

I was really hoping this downpipe did not the do infamous power dip, and like it shows... NO POWER LOSS anywhere throughout the rpm range.
STOCK VS VISHNU DOWNPIPE Comparision


Car
2011 135i
DCT Transmission
44XX miles
Mods - Procede V5 and Some Stickers

Delivery
1. In Stock (When I Ordered), and it came faster then estimated
2. Robert@Vishnu - Great first impression, very informative

Packaging
1. It’s a DP, so nothing crazy difficult
2. Wrapped in Bubble Wrapping for Insulation

Install
1. Amateur Install in under 2 hours with proper tools
2. FITMENT was perfect – no issues ( Alignment is KEY, before Tightening anything)
3. Came with gaskets and bolts Necessary for the install
4. Instructions included
5. Remember to Unplug the battery after install for the DME to recalibrate.

Craftsmanship
1. Minimal WELDS
2. Full T 304 Stainless Steel
3. Everything looks consistent
4. Welds are SOLID
5. Brackets for DP Support are really really strong ( MY FOOT CAN TELL YOU THAT  )
6. Bends on DP are Mandrel Bent
7. No sign of grinding anywhere on DP
8. O2 bungs pretty much are in the factory location
9. FINALLY IT LOOKS REALLY DA#M GOOD.

Price
1. Very Fair
2. The DP overall was a great price for the Craftsmanship, Availability and Functionality.

Overall Thoughts
- Exhaust TONE is really deep and throaty now
- Turbo Spool is very noticeable. Old grandmas in their 5.0 mustangs watch out
- Seat to Pants <<< (H@LY SH1T)
- Robert@ Vishnu, easy and awesome customer service
- Low End Torque Improved and, Top End is night and day difference







Last edited by htt760; 03-07-2011 at 02:57 PM. Reason: Added the Dyno Comp
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      02-23-2011, 02:03 PM   #2
Robert@vishnu
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N55 Downpipe

I am glad I was able to help. If you have any questions please feel free to email or PM me. Install should be fairly easy as we have ensured 100% fitment for every downpipe. Would love to see your review once you install it.

Videos??
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      02-23-2011, 03:01 PM   #3
Brey335i
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Lucky N55 guys. Only one pipe to work with haha

Looks great
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      02-23-2011, 03:02 PM   #4
htt760
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Hey Robert, Thanks for the support. I have it installed but no videos yet....
Very Soon...

Do you think there will be a catted version?
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      02-23-2011, 03:48 PM   #5
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awesome, need some vids man!
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      02-23-2011, 03:50 PM   #6
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Quote:
Originally Posted by Sloppy View Post
awesome, need some vids man!
+1

Shiv does it again
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      02-23-2011, 04:07 PM   #7
skyintothesea
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looks very good, specially inside is smoothly. Will order this after some time with new connector is ready.
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      02-23-2011, 04:23 PM   #8
Keik E92 M3
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Very nice... Can you post a video clip? Sound?
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      02-23-2011, 04:44 PM   #9
htt760
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Quote:
Originally Posted by skyintothesea View Post
looks very good, specially inside is smoothly. Will order this after some time with new connector is ready.
Yeah thats what I said when I first received it. Very Smooth and very minimal welds. So other ones i have looked at in the n54/n55 dp's you'll see some grinding going on.

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Originally Posted by keikdasneak View Post
Very nice... Can you post a video clip? Sound?
Will do as soon as possible.
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      02-23-2011, 06:05 PM   #10
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Looks Great! You can tell its a quality looking piece. Definitely going to pick one up!
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      02-23-2011, 06:09 PM   #11
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Quote:
Originally Posted by Iceberg3 View Post
+1

Shiv does it again
Lol thanks but im not the one welding those things together. If I were, they would look VERY different. And not in a good way.
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      02-23-2011, 06:12 PM   #12
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Quote:
Originally Posted by shiv@vishnu View Post
Lol thanks but im not the one welding those things together. If I were, they would look VERY different. And not in a good way.

It's cool Shiv, we promise we won't tell lol j/k

Excellent work regardless, especially the R&D on your part

Last edited by Iceberg4; 02-23-2011 at 06:31 PM.
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      02-23-2011, 06:15 PM   #13
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Clean welds!
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      02-23-2011, 06:26 PM   #14
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Quote:
Originally Posted by shiv@vishnu View Post
Lol thanks but im not the one welding those things together. If I were, they would look VERY different. And not in a good way.
hahahahaaha... I think i can say the same if i were welding. At least you are giving the N55 guys some love for product development.
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      02-23-2011, 06:59 PM   #15
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I really like the 3.5" vs. the 4.0" DP's. I've seen Juiced46 dyno result of the 4.0" AR's and I was disappointed with the results. I think the 3.5 is going to be the sweet spot! I'm ordering this!
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      02-23-2011, 09:55 PM   #16
htt760
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Quote:
Originally Posted by MJR63 View Post
I really like the 3.5" vs. the 4.0" DP's. I've seen Juiced46 dyno result of the 4.0" AR's and I was disappointed with the results. I think the 3.5 is going to be the sweet spot! I'm ordering this!
Although Juiced46 did mention that he has the XI version maybe the cause of the powerloss... AR does have nice products, but I have to agree with 3.5 inches.
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      02-24-2011, 01:41 AM   #17
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congrats.
nice look'n downpipe.
can u guys link me to the dyno for the 3.5 dp.

Shiv , Robert - how's the bung placement for the 335i and 335ix.
or is that placement in the pict above good for the 135 and 355
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      02-24-2011, 02:45 AM   #18
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Subscribing!! Awesome Work!!
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      02-24-2011, 12:45 PM   #19
htt760
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Quote:
Originally Posted by FrankiE90 View Post
congrats.
nice look'n downpipe.
can u guys link me to the dyno for the 3.5 dp.

Shiv , Robert - how's the bung placement for the 335i and 335ix.
or is that placement in the pict above good for the 135 and 355
FrankE90, just updated with dynos for you. Hope that helps, its directly from Vishnu on other post.
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      02-24-2011, 12:48 PM   #20
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Those are some Monster Torque gains!
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      02-24-2011, 12:49 PM   #21
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Looks nice! Do you plan on doing a before and after dyno with yours?

Also the XI has a different o2 sensor placement then the non XI. However it should still work no problem in the other location.

The dynos you posted. Are you sure that was a before/after of the DP? I could have sworn that post by shiv with the newest dyno sheet was after they gained fuel control not a before and after of the DP.
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      02-24-2011, 12:58 PM   #22
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Those are vishnus charts, not yours?

If so pointless...
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