When I get my divorce, I'm blaming TDR as a major cause! I got a 4" exhaust installed today..... OH, OH, OH!
Sounds great, runs great, I can't wait to tow to see what I gained.
Is the narrowed end that mates with the turbo housing a significant restriction? I tend to beleive that at the velocity the exhaust is leaving the engine, it will not be significant.

Is the narrowed end that mates with the turbo housing a significant restriction? I tend to beleive that at the velocity the exhaust is leaving the engine, it will not be significant.