Guys i have the 4 1/2 inch APs race exhaust system, when it went on the car i was only doing track days so noise wasnt an issue, im now using it as a daily driver and getting a lot of very strange looks from people, it has a very deep resonating sound etc. Is it possible to change the back box for something quiter or will it need a remap as well?

 

you can get a bung for them.. either custom job by H&S, cannot remember if APS do a bung themselves or not.

I don't believe you can get another back box to fit the APS pipework unless APS have started doing one since I last looked.. so you would be changing most of the exhaust so map would need checking etc..

Simon

 

Thanks Simon, does the bung effect performance?
Can anyone make one?
What are thet made of?
Sorry for all the questions dont know much about this!

 

will effect performance yes.

Hayward and Scott can make them I beleive.

two disks of metal and a perforated tube

 

I had H&S make one for my ninja, which was real loud - non-res and full decat.

Cost £25 +vat +del

Took a bloody lifetime and about 6 drill bits to put the hole in the backbox to screw the bung into.

 

Was there a noticable drop in performance?