Quote:
Originally Posted by OCMDGTO
If you're chasing a timeslip then yes it's worth it. If your just cruising on the street then probably not. I picked up a couple tenths going from 2.5 full mandrel bent to 3" from manifolds to mufflers w 2.5 tails. If I had it to do over I would go all 3 but was concerned with fitment around the 9" rear.
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Agreed. Another example on minimal impact of smaller pipes down stream... I have full 3" mandrel pipes with Ultraflow mufflers. For improved fitment, the 3" tail pipes are necked down to 2.25" chrome tips. I ran back to back 1/4 mile runs with and without the tips and zero difference on ET or MPH.
Of course the exhuast gasses have cooled considerably by the time they reach the tips, and the tips are only 10" long.
I have since installed cutouts after the H pipe when I race, which did provide an extra 1/10th or so compared to full exhuast.
As mentioned, if mostly street i would use a 2.5" mandrel bent system and reduce hassels of the larger pipes.
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