how the hell am i supposed to mount a 3 in catback to a 2 1/4 inch catalytic converter?

 

Get an exhaust connecter that's 2 1/4 to 3 inch and weld it in.

 

get a 3" cat

 

If you buy the cat-back tailored to your engine code it will come with a reducer. If you have a cat-back for TPI cars than you will have to fab up a reducer.

 

i have a better question

what is the point of having a 3" cat back with a 2 1/4 converter and 2 1/4" Y pipe??

you "might" see some HP/TQ but your bottle neck is the converter and Y pipe.

are you planning on changing these?

 

i see why your names killjoy

 

Even though he still has a bottle neck with the stock cat and y-pipe/manifolds he is still eliminating a large section of restriction. The stock I pipe is crimped and twisted and combined with a suffocating muffler which drastically effects performance. There is nothing wrong with going with a cat back now and upgrading your cat and headers later.

 

yes thats what i was getting at.. thats why i asked if he was going to replace those as well.

eventually you would want to, i know money is a consideration. i did the whole thing all at once (headers 3" cat, 3" mandrel bent all the way back, flowmaster) and it was a seat of the pants difference.

 

i too would like to do it at once but i cant... so i'll probably have to do it in steps... hence the question at the beginning of the post

 

Berlinetta,

Just get a 3" Catco Cat made specifically for a TPI Single-Cat Camaro/Firebird and a 3" Flowmaster Cat-Back. Any good exhaust or performance shop can easily weld the 3" Cat to your stock 2 1/4" y-pipe using a reducer. That's what I did because I too did not have the $ to buy good headers and do it all at once. You will notice a slight difference in performance just with the set-up I mentioned, and you will surely notice a difference in sound. Get your headers/y-pipe later when you have the $. Good Luck!

 

Catco and Random Tech all suck.. they break up very very fast. i was at Dyno Dons shop yesterday and a kid came in with his car rattling

he just (1 month ago) had a new catco cat put on and its now broken up into pieces and floating in the case.

get a CarSound cat.. they're not expensive

 

I've had my Catco Direct Replacement 3" cat on for a good 6 months and it is holding up fine...no rattle, no breaking up.

 

random tech has to be one of the best, if not the best converter on the market. I've got 2 of them on my LS1 and they flow plenty for my heads/cam motor. No "breaking up" either.

 

i have the carsound 3" universal for almost a year and no problems

 

why would anyone want to pay soo much for a Random Tech cat though?? soo over priced

 

Because they are the best.

 

well put shifty :hail:

 

sorry they're not the best.

 

really? Can you see through yours and still pass the sniffer? I can.

http://www.provenperformanceconcepts...etallicMED.jpg