If you do NOT have boost running through your engine do not get the 3" downpipe.

 

x2... you'll lose quite a bit of back pressure.

 

Agreed! I lost a lot of power on the low end with the 2.5 downpipe so I know the 3 inch will be worse...

 

with it open you mean or just in general? I can't see you losing it with just the 2.5" and exhaust...

 

Kinda both. I lose a lot when I run open downpipe but the difference in when I had my flowmasters on and now with no mufflers can be felt, which is why I was in the market for some mufflers... I feel like I was faster with the stock downpipe and flowmasters than with a zzp downpipe w/cat and straight pipe... I know the downpipe is a plus but I didnt have it with my flowmasters so I dont know how well they are together...

 

I just deleted my mufflers. Easiest and cheapest way for a nice sound. I love loud so if you do too. Just cut out the mufflers. Up front of the cabin is a little noisy not bad. You can carry a conversation with the passanger. As for the back seat. Forget it. They can't here you. As for the rattling and such. It's not half as bad as when you young wipper snappers have those super bad asp stereos cranked up. So cheapest way. Delete mufflers.