I just removed the B&B downpipe(had fitment issues and needed to be sent back to B&B) and reinstalled the stock downpipe. I actually like it with the stock on. The sound is a bit quieter than the full 3" and a bit louder than stock. I have power all across instead of just mid and top end with the 3"(no low end power but improved mid and top end) and better driveability around town. As of now, I have the stock downpipe, UR high flow cat and B&B cat back. So, how much power am I actually losing without the 3 " downpipe? Thanks in advance.

 

i would just say about 2-10 hp across the powerband. it also depends on what fuel management. because it would be more if you were tuned for the 3inch TB.

 

I am still stock in that department. I am planning on getting the mail in flash through Dynoflash in the future. I thought I was actually losing more in stock form but if it is just around 2-10, I'll take it.