VQ'rInWLA

iTrader: (83)

So Im planning on upgrading to a custom 3" mandrel catback and wanted to get rid of the last bottleneck which is the cat. While browsing on eGay, I ran into a universal 3" resonated test pipe. I know being resonated will restrict airfow in comparison to a straight/test pipe but I dont want it to be obnoxiously loud or raspy.

Which leads to the true purpose of the thread: how long is the OEM cat from flange to flange? Want to figure how fitment will be. The custom mandrel shop Im going to wont touch the cat. Only the B and back.

Comments and advice about this next project also welcomed!!

Link to the 3" RTP below:
http://cgi.ebay.com/ebaymotors/Unive...#ht_1219wt_772

-DB

schmellyfart

iTrader: (46)

Clashez would like this, its 3" inner dynamiter.

OEM cat is 12.5" long.

cashoit

there isnt going to be much pressure drop or decreased velocity with the resonator. I wd replace the cat with that at least. Keep the noise/rasp to a minimum.

VQ'rInWLA

iTrader: (83)

schmelly, hows the piping done on your exhaust? From 2.5" to 3" right? How is that made to work? Flared piping to flanges of the same size?? Always wondered this..

schmellyfart

iTrader: (46)

> 2" header collectors
> 2.25" y pipe primaries welded to 2" collector flanges
> two 2.25" merge into single 3"
> 3" test pipe
> 3" exhaust

VQ'rInWLA

iTrader: (83)

Ahh I forgot you were running a custom y. Dont wanna touch my headers/y (OBX) so my customizing will be from the cat and back. Will see if they can flare a pipe to fit one end of the test pipe (3") from the y pipe (2.5"). Flanged would be nice but if not, I may just get it welded in.

schmellyfart

iTrader: (46)

A 3" flange will bolt up to a 2.5" flange. I had my 3" exhaust bolted up to my 2.5" test pipe, I also had my 3" y pipe bolted to the 2.5" test pipe for a short time as well.

VQ'rInWLA

iTrader: (83)

You took a load of stress off of me bro!!!! Much appreciated. Really need a rep system for ppl on here. Def get a +1 from me!!

schmellyfart

iTrader: (46)

lol No problem.

The Wizard

iTrader: (43)

Do you not have an existing cat to measure?

Also, the cat is hardly a restriction. You'll pick up 1 to 2hp if you're lucky. W/o a cat, your car will be stinky. Keep the cat and focus on getting a really good resonator in the bpipe. My 2 cents.

VQ'rInWLA

iTrader: (83)

No space to jack car up and look. Also seems my cat is going out anyways. Caught a good whiff yesterday. Car is being built for a S/C thus the upgrade to 3" all the way back.

VQ'rInWLA

iTrader: (83)

Nevermind. Answered my own question. Power of the interwebs

http://cgi.ebay.com/ebaymotors/2-bol...ht_2352wt_1165