I put some gt350 exhaust on my 15 and love the sound...it only has an xpipe with stock manifolds...But a buddy did the same and has longtubes and the exhaust sounds so good...best mod I have done...exhaust only cost me 300 bucks and everything else I did it on my own
I traded in my s197 and kept my wheels because I didn't like the base wheels on my s550...they are a bit in would 25mm spacers work for me...I've see 25mm spacers on s550s before but they were using pp wheels and the stock stud was sticking out past the spacer...im thinking it won't work for me