Quote:
Originally Posted by SPLATT
What makes these cars louder with headers? Anything I put headers on in the past weren't any louder until I put louder mufflers on.
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When I said headers, I meant long tube headers (because I consider shorty headers a total waste of money, stock is pretty good for what it is), sorry for being terse.
To be 100% honest, I don't know the exact reason why long tubes are louder. I do know they have thinner walls (making the high pressure fuel pump tick louder), and I imagine the different, simpler exhaust routing as well as deleting the secondary cats are the main reasons; after all, the car only has 2 (or zero) cats instead of 4 after installing these headers.
In terms of volume, I'd say my car is ~25% louder on the outside than stock at idle and cruising, 50% louder at WOT, and cold starts are like absolute thunder while warm starts remain tame. Inside the cabin there is very little difference until I lay on the pedal, and it's tangibly (but not oppressively) louder at WOT, a very enjoyable experience. I still have the original "big suitcase" NPP exhaust with the valves.