Stroker M20 exhaust

[MaxBell]

Interesting, so if you combine to 1 pipe too early or too late, you lose power? How significant?

[digger]

part of the reason i want to redo the exhaust is that i did some changes a couple years ago that hurt power alot. mostly moving the X-pipe too close to the engine.



100km/h is 3400rpm. so at about 3600rpm there is a 15kw loss which is 14% loss of midrange.

The two most powerful naturally aspirated M20 engines publically known both use single exhaust so it works. knowing this pipemax says 32" is the correct location for the Y-pipe and Burns X-design says 30". So both are in good agreement so that's decided.

The current exhaust has been butchered and modified alot and there are so many step changes. i have 2" secondaries to an X-pipe then 2x 1-7/8" into 2 x 2-1/4" then im sure there are a few places where it looks 2 x 2.5" to join the resonator and muffler which doesn't help droning.

[digger]

Nice thread. I think the Vibrant is the best resonator out there, as far as I have read. It's been used quite a bit.

thats what i found with my quick search, thanks.

anyone got a m20 with borlas pro XS? sound clips?

[MaxBell]

Nice thread. I think the Vibrant is the best resonator out there, as far as I have read. It's been used quite a bit.

[digger]

I want to fix up my exhaust. I’m looking to go to a single pipe probably 3” because stuff is more readily available in 3” vs 2.75” and backpressure with 3” things like catalytic converter, resonators and muffler would only seem to be less though maybe not proportionally since it’s the guts of it that governs flow and often the guts are the same/similar


CONFIGURATION



MERGE

Plan on ridding the X pipe


And adding one of these venturi collectors from burns, not sure what venturi size would be best and would make it so that the position can be varied without too much difficulty to test a couple different lengths as it seem to have a big impact on torque and power over a pretty large band of rpm



RESONATOR

A hate too much drone and excessive rasp
I’m thinking vibrant ultra-quiet resonator. Anyone used this? Anything better around? ground clearance a probelm?



CATS

Due to legality I must run
Will use high flow 100cell metal cat with nice gradual expansion and contraction example below



MUFFLER

I like twin exit aesthetics so single in dual out it needs to be what I have seen. Anyone know what brands would fit behind mtech2 rear skirt

Borla

http://www.summitracing.com/dom/part...0670/overview/
http://www.summitracing.com/dom/part...0349/overview/

dynomax

http://www.summitracing.com/parts/wlk-17273/overview/

http://www.summitracing.com/parts/wlk-17519/overview/

http://www.dynomax.com/mufflers/dyno...ed-offset.html

Anyone got pics of their exhaust from underneath?