Okay well after all the research I did I knew I was going to get rasp with test pipes & a y pipe on a stock sedan exhaust. It is a lot worse than I thought, but I'm ganna live with it until I find a solid fix. I was just wondering what Axel back exhaust, mufflers, or just resonators I can incorporate to kill the rasp? Sounds good until 3k rpm then improves after 4k. Any suggestions? Probably ganna start with resonated TP's after pay day

 

Test pipes are almost always going to give you rasp. Without knowing how much you're willing to live with, I can't really recommend an exhaust for you.

However, as a general rule, more restonators = less rasp. High flow cats should take care of the problem pretty handily, and any of the aftermarket resonated exhausts should clean it up.

You can also take your stock exhaust to a muffler shop and have them cut out a section and weld resonators in. Might even be cheaper, no idea on how much it might help though.

 

The test pipes are your issue. I'd change up to HFC's and an axleback exhaust. I don't think the Y-pipe has much to do with the rasp. I have HFC's and Tanabe axlebacks w/ stock everything else. I only have rasp when the exhaust pipes are cold with a hard take off. Within a minute of driving no rasp can be heard.

 

Thank you, I think the exhaust shop idea might work. Eventually I will look into an after market Axel back but I wanted to keep stock mufflers for that OEM look

 

HFC have very noticeable rasp as well, just less than test pipes. Your solution is to get an entire engineered exhaust system that's properly designed and built to not have this problem. Swapping out a different component here or there to fix it isn't going to work well to solve the problem.