my mate is after one for his uk turbo but it has to be a quiet system as he does not want it to be loud , he ios only going for the first map and onit and only wants to get to the 270 mark on the tubo it has which i think is the tdo4 he got 440cc injectors so do any of you have any thoughts on this as ive

 

i had a hayward and scott backbox which was 2.5" shame because i just sold it, but i sold it the reason was it was too quiet! probably the most quiet ive ever heard on a scoob, i know have a staright through race pipe setup Mwhahaha!