Quote:
Originally Posted by Back Road Runner
The header does all the tuning work. The rest just get the exhaust to the back of the car. Bigger is actually better when it comes to the rest of the exhaust but can be bad at the header (or intake runners, heads, cams) if the engine isn't built for higher rpm use.
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Do you have data to back that up? The info that I've seen is that larger exhausts mess up the scavenging effect.
Haven't touched my exhaust yet and I want to make sure I understand what / if it is worth it to replace things.