sean9975

has anyone tried to remove pre-cats, manifold staight 2 high flo cat ,"y" fitting staight 2 mufflers on sc 400?

Lucky SC

yea i think so

some guy deleted all but center one and put in an "x" pipe there all custom 3" piping

3" w/o a turbo though doesn't sound good


HE SAID it turned out good, i didnt get any specific stat changes

Lucky SC

i'm sure Y would work though btw

jibbby

I have, what do you want to know?...I deleting the precats and I also used the magnaflow 2 into 1 center cat with the built in high flowing Y design...Good improvement in power was noticed at higher rpms from both changes......Deleting all cats and installing a highflowing X design would be the best option for performance, but say goodbye to passing smog emissions...

sean9975

see that's the only thing. it wont pass emissions? that sucks is threr a way around that? or do you have to have the pre-cats to pass?

jibbby

Well you can ditch the pre-cats and install two single high flowing cats and locate them else where on the exhaust system..Custom down pipes will need to be fabed..It maybe hard to find exact fitting replacements...Search I think I read somewhere about replacement high flowing precats from Magna flow......

I do know you need all three to pass emission here in California where I live..The one main high flowing center cat is not enough to pass......

sean9975

how much did those headers set u back?

jibbby

Too much...$700 for the S&S Headers, $400 for the prefabed down pipes, $300 for entire intallation.....$1300 total for the headers installed and alot of fitting headaches.... If I were to do it all over again I would have paid $900 for the EKtuning.com headers...Atleast they are a direct bolt on header as apposed to the S&S's.....