the back box i have on atm is too loud for my taste's tbh so putting the feelers out to see if anyone with a quieter back box would fancy a swap or even a full system ive a ss cat back cheers
If you have a big bore tip get a sliencer off eBay £10 -20 and sits in and bolted on works a treat. I have a straight through and I got it and not it cut bye 70% or so. Gives a nice tone.
If its an aftermarket system then you wont be able to simply swap back boxes with someone else and no two systems are the same, the B-pipes and flanges are different on them all and so you would need to swap the entire system from the cat back.