33 IMP
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I operated under the same theory. Both of my hotrod headers (one set hooker supercomp adjustable, one set full custom) used 2"tube and a 3 1/2 collector. So, I used 3 1/2 pipeYes, I have to say. I installed the 3" exhaust with an H-Pipe and I didn't lose any HP at all. Matter of fact I may have gained. Since I never tried 2 1/2" I guess I have nothing to compare it too, however anyone that says that you lose HP just isn't true. I have the smaller 1 3/4" TTI header that goes out the 3" exhaust and I think that may be what the trick is.
Can't say I noticed any power loss. The n/a small block car went nines through the mufflers.