I'm getting ready to buy a Apexi N1 cat back. Does anyone have some suggestions on a good down pipe and a cat? and where to find them at. for an 87 Tll

 

I have a N/A but I have N1 duels that I got from rx7store.net, after I bought them it took over 3 months to come to my door. I don't remember where I bought my downpipe from but it is Racing Beat and I think both are good quality.