Quote:
Originally Posted by jdlmodelt
Would the aftermarket header exhaust manifold really make any improvement on power since this doesn't have the pre-cat?
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Small improvement at high rpm, probably noticable loss at low rpms.
If I had a 2.5 I would have stock manifolds ceramic coated inside & out to retain heat inside rather than dissipate that heat to the heads & camcover area.
May be able to gain some flow by grinding welds at tube entrances & exit also.