I am looking to run dual stacks in my '04. My question is what size would be best? i was looking at 6"-8". i have stock exhaust now so i dont know if those to 8" tips would relieve to much backpressure, or no. hopefully if all goes right i will have a quadzilla adrenaline chip within the net 2-3 months to, so idk if that might help. please send them forward if any videos or comments

 

i like, 4 inch turbo back, 5 inch Y pipes, and 6 inch stacks, but that is just me personally

 

thats what I have..

 

i think 7's look good JMO

 

8" sounds sweet at about 70mph.

 

look at my sig, those are what my stacks look like... 5 inch all the way back. It's very very clean

 

the bigger the better i wouldnt worry about backpressure. on my friends 12V hes got 4 down pipe into 5 with 1 7" an it sounds like a pulling semi at 65-70mph