Drivetrain Catless Downpipe and AP
#52
11-18-2011 | 05:27 AM
3rd Gear
Joined: Nov 2010
Posts: 222
Likes: 2
Standard MCs exhaust diameter
Just wanted to add some knowledge to this thread. The stock exhaust from a MCs is as follows:
DP to the front of the flexim: 63,5mm or 2,5"
After the flexim till in front of the resonator: 60,0mm or 2,36"
After the resonator till in front of the back box: 55,0mm or 2,17"
That is the reason why a 63,5mm/2,5" system from turbo back gives such good gains. And of course removing the catalyst gives you a free flowing system with high potential.
DP to the front of the flexim: 63,5mm or 2,5"
After the flexim till in front of the resonator: 60,0mm or 2,36"
After the resonator till in front of the back box: 55,0mm or 2,17"
That is the reason why a 63,5mm/2,5" system from turbo back gives such good gains. And of course removing the catalyst gives you a free flowing system with high potential.
#53
11-21-2011 | 07:34 AM
Sorry Mike, I should have explained it better. This is they dyno sheet:
Shows that this JCW with our 3" turbo back exhaust with 2 high flow cats system made power by simply removing one of the high flow cats! This shows that even with a 3" system with high flow cats, the JCW benefits from higher flow.
So far just about everything is theory, since no one that I know of has done a back to back test of a 2.5" system on a 3" system. But I'd bet my sandwich
(that's a pretty big deal because that's pretty much my whole lunch) that the car with the 3" system will make more power.
Shows that this JCW with our 3" turbo back exhaust with 2 high flow cats system made power by simply removing one of the high flow cats! This shows that even with a 3" system with high flow cats, the JCW benefits from higher flow.
So far just about everything is theory, since no one that I know of has done a back to back test of a 2.5" system on a 3" system. But I'd bet my sandwich
(that's a pretty big deal because that's pretty much my whole lunch) that the car with the 3" system will make more power.This does not prove that a 3/4" diameter garden hose, hooked up to the same 1/2" spout does not flow at the same rates.
Apples to oranges. All it showed was the cat is VERY restrictive (which I think we all agree on)
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