thats true its not like the stock catbacks r that restrictive. ive been looking at t.o.g ther really nice i might go with them, do u know if the hogan modular downpipe would bolt up to t.o.g's or should i just go with the random tech.
It will be the pipe you weld to the DP that includes the cat/U bend..
Look under your car, if stock exh. you'll see an ugly, restrictive bend (by pass door hinges) in the shape of a "U" where the rear O2 is loc., the solution, cut the ubend out, weld O2 bung @ 3oclock (instead of stock 12 oclock), problem solved . If you want to run cats (or have to) you'll need that pipe, or one made w/ a hi flow cat.
Some lucky people dont have E-tests, so they dont need the cat
CRAP! Almost forgot! see if you can find an 02 Extension! I fried my front o2 harness when it hit the header, and is EXTREMLY Tight to run it w/ contact on the header due to the o2 loc!
something like this http://www.lmperformance.com/2595/1.html
(not sure if that one will work or not), I still havent fixed mine, but have a new harness on its way for the new build, and going to cut/solder the old into the new to get the length i need