Downeys! The only really hard part was removing the factory crossover pipe. But then if you're not going to keep it then CUT IT OFF! My Runner was fairly new so I didn't even think about cutting it. I also got the whole exhaust system which includes the cat (2 1/2" all the way thru) because I did not want to take it to a muffler shop. Even with the pita I would still do it again. Big difference, very noticeable! Remember my Runner was fairly new so make sure your engine is running good so you can make a fair comparison. BTW, no problems with Downey customer service. Good luck!

 

Generally agreed, but they never seem to have stuff in stock. I bought my headers from a retailer, and the crossover had to be drop shipped from Downey. Downey spent about 6 weeks telling me "soon!"...