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      03-31-2014, 07:54 PM   #1
Rajvosa
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Test pipes installed... tune will be soon as well

Hi all,

yesterday I had the exhaust guys fab up some test pipes to remove the primary cats. cheapest quotes I was getting to buy some aftermarket test pipes would be around $500-$550 delivered to Perth.

this cost me $200.

initial thoughts:

- louder at cold start (I have a remus street muffler)
- when warm, no noticeable difference in noise up to about 3000 or so.
- around 3500rpm onwards there s some rasp that wasn't there before. its definitely not too raspy (im guessing if I had a 'race' type exhaust it would be much louder). I like it as its turned out!
- car has gained power...especially mid range. exiting a corner in 3rd gear it definitely starts to pick up sooner than before.
- I can also feel and hear the extra air pushed out where cats used to be...its a bit of a weird sensation. I thought it was some kind of vibration to start of with but cant see anything touching.

TUNE:
ended up buying the Evolve tune. chose them basically as they seem the be spending a lot of money and time into producing parts for M cars.. (plus some discount as I had their tune on E46 M3 before).
-the tune/cable was paid for around Thursday, I had the evolve r cable in my hands on Monday morning
- I have sent of my stock map to them, waiting to get tune back.
- will not touch stock rev limiter or speed limiter.
- don't want servotronic tuned as I like the light steering feel when not in M mode.
- got a cool option 'overrun back fire' (google if you don't know it) but not sure if ill run with it.

anyways, gonna do a dyno soon to see gains with these mods from stock car
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      03-31-2014, 09:13 PM   #2
Mana
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any CEL errors as a result of removing the primaries?
What about exhaust smell?
Dyno results will be interesting.
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      03-31-2014, 10:02 PM   #3
Rajvosa
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Quote:
Originally Posted by Mana View Post
any CEL errors as a result of removing the primaries?
What about exhaust smell?
Dyno results will be interesting.
no CEL just yet. they will appear after a certain amount of kms. (I bought an akrapovic delete R cable which will remove it) may not need it anyways as the evolve tune will also delete it.

smells fine as the secondary cats are in place.
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      04-02-2014, 12:24 AM   #4
drjekl
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$200 wow that's crazy cheap!?! Are they even stainless?

Where are the pics
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      04-02-2014, 12:57 AM   #5
Rajvosa
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Quote:
Originally Posted by drjekl View Post
$200 wow that's crazy cheap!?! Are they even stainless?

Where are the pics
that's pipes welded on one side and re using flanges off the cats on the other side. so its basically two straight pipes with O2 bungs on them.
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      04-02-2014, 02:47 AM   #6
DR-JEKL
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Quote:
Originally Posted by Rajvosa View Post
that's pipes welded on one side and re using flanges off the cats on the other side. so its basically two straight pipes with O2 bungs on them.
Ahh ok!!!

Sounds like a cost effective mod, wouldnt it be the same as punching the catalyst material out?
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      04-02-2014, 04:27 AM   #7
Rajvosa
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Yes I guess so but then I'd ruin the cats in case i wanna go back to stock
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      04-04-2014, 05:27 PM   #8
EarthboundMisfit
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So, you basically did ACM test pipes?
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      04-04-2014, 06:51 PM   #9
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can you share with us after the tune i just got my test pipes also i would like to see with the software.
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      04-05-2014, 01:23 AM   #10
Rajvosa
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Done a few little mods to the car, as its becoming a weekender. (bought a 325ti for daily duties)

Had some De Cat pipes made to remove Primary cats (secondary cats are still in place).
Also bought a Tune from the guys at Evolve Automotive.

Dyno showing Stock (Red Line) Vs De cat + Tune (Blue Line)



Basically around 20 wheel hp PEAK gain.
Mid Range (4000rpm or so) i have gained around 30 wheel hp. that is a HUGE gain and massive benefit in feel of the car.

it has also given the exhaust (Remus) louder note and more of a 'bite'. Loving it!

massive thanks to the guys at Evolve on the prompt service as usual!!
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      04-05-2014, 01:30 AM   #11
Rajvosa
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Quote:
Originally Posted by EarthboundMisfit View Post
So, you basically did ACM test pipes?
yes. didnt think it needs to be anything more fancy than simple two pipes with o2 bungs. worked a treat
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      04-05-2014, 01:54 AM   #12
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Quote:
Originally Posted by Rajvosa View Post
Done a few little mods to the car, as its becoming a weekender. (bought a 325ti for daily duties)

Had some De Cat pipes made to remove Primary cats (secondary cats are still in place).
Also bought a Tune from the guys at Evolve Automotive.

Dyno showing Stock (Red Line) Vs De cat + Tune (Blue Line)

Basically around 20 wheel hp PEAK gain.
Mid Range (4000rpm or so) i have gained around 30 wheel hp. that is a HUGE gain and massive benefit in feel of the car.

it has also given the exhaust (Remus) louder note and more of a 'bite'. Loving it!

massive thanks to the guys at Evolve on the prompt service as usual!!
Very good gains A and costing next to nothing
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      04-05-2014, 06:21 AM   #13
DR-JEKL
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nice work!
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      04-07-2014, 12:21 AM   #14
Msports180
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Nice work.

Hyperdrives dyno is notorious for reading low to, my Skyline did 380hp on there's then 420hp on another.
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      04-07-2014, 02:03 AM   #15
Rajvosa
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Quote:
Originally Posted by Msports180 View Post
Nice work.

Hyperdrives dyno is notorious for reading low to, my Skyline did 380hp on there's then 420hp on another.
cool, thanks for the info.

as long as its accurate between two of my own readings then its all good.
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