Reducer Needed Or Not !

[ACTIV32]

hey guys just a question im making a custom exhaust and need to know if you need a reducer from the cat to the first part of the 3" pipe or can i just bolt up both flanges with the cats stock size going straight into the 3" pipe

hope that made sence

cheers Daniel

[Munkyb0y]

lol that made no sense at all

if you mean, will a stock cat bolt up to a 3 inch exhaust. yes it will. the flange holes will line up

[mad082]

yeah what tony said. the 2.5" flanges on the cat will bolt up to the 3" flange of the cat back. infact it will even bolt up to a 3.5".

[Craved]

get a 3 inch cat to go with your 3 inch exhaust - not really much point in using a small cat with a larger exhaust

[ACTIV32]

yer tru im also takin out the inside of the cat and putting in a 2.5" pipe in the stock cat just to make the outside look legal well that should do it

cheers

[rb26s13]

dodgy illegal and still defeats the purpose of goin 3inch the rest of the way.

[mad082]

yeah, just get a 3" cat. that way there isn't extra turbulence caused by the size reduction.

[ACTIV32]

yer tru tru well how much do 3" cats cost cause im on a budget cause i just bouht a house but i suppose that im do the full zorst so i wont doge the job

also whats the difference in power with a decat pipe also a new 3"cat

cheers Daniel

[mad082]

well other than the $12,000 fine if you get emissions tested without at cat, the performance difference between a 2.5" decat and a 3" cat is probably very little. plus having the cat will mean you don't get so much crap on the back of the car around the exhaust.

a cheap 3" cat can be picked up from under $200 off ebay. i bought one (an x-force one) and it worked fine for 200kw.

[ACTIV32]

im convinced cheers mates you just mite of saved me $12000

ill buy a 3" cat

thanks mate

Daniel