I recently picked up a set of LT headers as the exhaust that's currently on there is garbage and the manifold flanges are warped and constantly leaking. Anyway, the headers join into a 2" x-pipe. I've tried googling every possible word combination to try to answer my question before making an account just to make this post.
Is running dual 2" exhaust from the x-pipe excessive for the M20? The current exhaust is a single 2.25" from a y-pipe right off the manifold and crush bends all over the place. Should I just cut the x-pipe in half and turn it into a y-pipe and run a proper mandrel bent 2.25" single exhaust? I know there's a bunch of talk about back-pressure and exhaust velocities and loss of torque etc etc but my smoothbrain is still unsure of exhaust diameter relationships and to me going from dual 2" into a single 2.25" seems to be too much of a neckdown.
However, the headers collecting 3 cylinders into a 2" pipe before the x-pipe seems excessive in the other direction, as I've read a bunch of posts about people running single 2.25" setups. I feel like I'm overthinking things and while I'm keeping the car relatively stock, I want to at least have my exhaust setup as efficient as possible.
Is running dual 2" exhaust from the x-pipe excessive for the M20? The current exhaust is a single 2.25" from a y-pipe right off the manifold and crush bends all over the place. Should I just cut the x-pipe in half and turn it into a y-pipe and run a proper mandrel bent 2.25" single exhaust? I know there's a bunch of talk about back-pressure and exhaust velocities and loss of torque etc etc but my smoothbrain is still unsure of exhaust diameter relationships and to me going from dual 2" into a single 2.25" seems to be too much of a neckdown.
However, the headers collecting 3 cylinders into a 2" pipe before the x-pipe seems excessive in the other direction, as I've read a bunch of posts about people running single 2.25" setups. I feel like I'm overthinking things and while I'm keeping the car relatively stock, I want to at least have my exhaust setup as efficient as possible.
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