Depends on what your values are, in some instances 1hp can be the difference between 1st and 3rd place.
Quote:
Originally Posted by Cole
Why is it not making a difference? Is it because the pipes are too big of an ID, so that efficiency isn't being affected because there's still tons of room to evacuate the exhaust?
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Well the fact that they had gains when they first smashed it up (decreasing the diameter) kind of points in that direction and only had losses when they really smashed it I'd agree, their headers were oversized to begin with. There's a telling comment he makes at the end that the difference between 1 5/8" and 1 7/8" makes a difference and you should pay attention to that. Maybe if they started with a smaller diameter they would have seen those losses on the first round of hits.
I also think a big displacement V8 would be less sensitive to exhaust restrictions as they are generally designed further from the limits of efficiency than a low displacement 4-banger like the FA20 where any choke point is noticeable.
If I was doing what roadkill does? Big engine swaps on a budget with little heed to competitive uses or maximum performance, yeah, take a hammer to it and make it fit if the clearance can't be managed.