Quote:
Originally Posted by edram454
...3" pipe discussion...
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The LT5 defies convention... 3" pipes seem to work very well along with the oblong 2" primary header diameter. I would like to try out a 1-7/8 set of longtubes, but seeing as how that's about the same size as stock, it is obvious that this engine is a little unique on tried and true hot-rodder dogma doesn't strictly apply.
Given that, I'd probably prefer to run the metric sized stock pipe which is right at about 2.7" diameter (which in itself is a clue that GM knew 2.5" was too small). My 5.0 mustang and LS3 cars both have pipes smaller than that and make similar power at similar revs, but the LT5 just seems to like the big pipes and i can't totally explain it. If anything, it moderates the torque at and below 3500 rpm making it a little less likely to spin off the rear tires on the roll. Also, the ZR-1 has never been the king of 60 ft times - it's all about the top end and not having to shift as much.