I've been doing a bit of searching but can't seem to find a definate answer on N/A exhausts. I'm trying to find what will be best for performance on an N/A without it being loud. I was going to just get the standard system de-catted and get a nice backbox but have decided to wait and go for a full system with a manifold aswell. I know of the OBX and Pacesetter manifolds but these are for the 5E, although they still fit the 4E, correct? What other manifolds are out there - and more importantly which one is best for making power, preferably at the top end, but without losing too much bottom end. As Rich or someone said a few days ago a 4-2-1 should be fine aslong as the pipes are fairly long (or something like that, I've forgot now). As for the exhaust itself, I should stick as close as possible to the standard diameter, correct? But, I don't want it loud, so what silencers should be there? I was looking on the blitz website yesterday and they make those active silencer things which go in the end of the exhaust - do they help to make it quieter or do they just lose power? And finally the backbox, are there any manufacturers out there that make subtle 2-2.5 inch backboxes as they all seem to be 3-4 inches. Basically I want more power without it sounding like a fart in a tunnel, I know there will be some increase in noise but I just want to keep it nice and quiet if possible. Bit of an essay but should help with non turbo owners who want to know more