He still has stock manifolds. He opened the exhaust too much after the downpipe. He knows. I've told him (and I've told him it sounds like ****
There are alot of issues with this car. The weight of the audio stickers alone is killing his mileage.
I also ran into him at the parts store recently and saw his pink quasi-FWI made with something like the plastick dryer vent hose. I told him if he didn't take that off his car, I'd take a pic of it and post it.
The heat it'* soaking in, and the restriction it'* giving him is killing both performance and mileage.