Went racing this weekend and the Kooks headers and Race catback are pretty loud and dronning on ride home. Random tech cats quite a little but not enough.
Wondered if anyone added the muffler part if it made a difference?
I've got the Corsa Tis hooked up to TPIS headers (with my cats intact). I've got the mufflers on the system -- but I've ALWAYS had the mufflers on, so I don't have a comparison. I was going to swap in the straight pieces this spring, though, and see how it sounds without the mufflers -- but I DO like the sound with the mufflers (I might just prefer it be a tad louder).
One thing I can say is that there is NO resonance with my system. I don't know if that's a function of the mufflers or not, but I have no resonance at all.
A little less rasp and a lot less vibe would be ideal.
Might bolt it on and give it a try but when I looked at it I didn't think it would help much.
Of course it's not so bad but a little less noise on ride home from track would be good.
Partion helps a little