i plan on finishing my ls swap this weekend. i want to use a exhuast manifold from a 1990 integra cuz the o2 sensors are in the right spot. i know this manifold is going to be too long. does anyone know how much i need to cut out of the downpipe for this to fit like stock exhuast? i'd like to cut it to the right specs and drop it in, rather than have to put it on, take measurments, take it off, etc. i have a lot of stuff to worry about this weekend for this swap. can some one help me?

thanks,
-kyle

 

lol thats kinda what I did with my b16a swap... but aftermarket 91 integra header, and I had to cut like 3 inches off my exhuast piping behind the cat, twist the cat part and re-weld it... lots of work

 

well. im trying to see if i can just cut the manifold to shorten it and get it to end back where the stock manifold would end. that way the rest of the exhuast will fit on like stock. sounds simple enough. u said u have to cut like 3'' off?

 

ya it was around there, sorta guess and check, but you will want to pull it off a few times and do it right, believe me.

 

i bought a $10 testpipe off ebay and went under my car, took the cat off, stuck it up there and made some marks where to cut and then had my friend cut/weld it back together and tada.