[Shotimes] Walker cat-back smaller than expected.

[Michael]

 Hi, I just realized, after having used it for 4y now, that the Walker/Dynomax cat-back is actually only a 2.25" system, and not a 2.5" system as I had thought all along. Also, the output pipe of the HiFlow cat is only 2.25". According to some flowdata that I saw, a 2.25" single-pipe system will definately restrict the flow of even a slightly modified SHO. Not by a lot, but it's not optimal.This latest "revelation" makes me wanna try to make a custom 2.5" exhaust system as follows: 1. move the rear cat 6" further back to optimize its position. (Apparantly, 12-18" from the exhaust manifold opening is optimal for a 2.25" cat.)2. replace the two rear cat pipes with 2.5" pipes.3. make a more tapered merging of the two rear cat pipes.4. drop the resonator.Have any of you done something similar? Any comments appreciated. I expect to gain about 5HP from this. I like the single-pipe configuration, and don't wanna go to dual-pipes. Dual-pipes is too much work, and the consensus, I believe, is that I would loose too much back pressure and thus torque at low-RPM. Michael94MTX,green,BOS+

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