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1bad89
11-02-2009, 02:39 PM
i just had a 2.5 exhaust from the cat back installed and wanna remove the cat. (none of the shops would do it ) anyways, whats the size of the pipe coming into the factory cat so i can get some pipe to replace the cat with ?
Mopar318
11-02-2009, 03:03 PM
:confused2:Measure the pipe?
1bad89
11-02-2009, 04:08 PM
how can i get the o.d. on the pipe with it attached :confused:
ShelGame
11-02-2009, 04:22 PM
Measure the circumference with a tape measure and divide by 3.14?
minigts
11-02-2009, 04:33 PM
Measure the circumference with a tape measure and divide by 3.14?

You should have said Pi, so he would have to divide by 3.141592653589793238462643383279502884197169399375 1058209749445923078164 0628620899...
turbo van go
11-02-2009, 04:43 PM
cant u just cut the pipe loose then measure?
1bad89
11-02-2009, 05:39 PM
i dont wanna cut the pipe til i get all the necessary hardware to fix it back. Wouldnt it just be the stock DP going into the converter whatever size that is ?????
PBODY
11-02-2009, 05:46 PM
If it is a stock DP and the car is an 89 or newer, isn't it pretty close to 2.5"
turbovanmanČ
11-02-2009, 06:05 PM
2.5 inch OD in, 2 1/4 OD out.
minigts
11-02-2009, 06:10 PM
2.5 inch OD in, 2 1/4 OD out.

Wait, so the stock exhaust is 2.5 on the inside, but 2.25 on the outside? That's a little strange! :)
turbovanmanČ
11-02-2009, 06:12 PM
Wait, so the stock exhaust is 2.5 on the inside, but 2.25 on the outside? That's a little strange! :)

No, silly man, inlet and outlet, :o
turbo van go
11-02-2009, 06:36 PM
yes mine was 2.5" dp
bradp
11-02-2009, 07:10 PM
It's an 87 so it should be 2.25
1bad89
11-02-2009, 08:10 PM
ok, so its a 2.25 going into the cat, its an 87, brad should know :thumb:, so all i need is a 2.25 pipe and have it opened up on one end to 2.5 to match the rest of the exhaust ?

by getting rid of the stock cat will it help alot with the flow and such or is it not really worth the hassle ??
turbovanmanČ
11-02-2009, 09:04 PM
Yes, it will help huge but if you have an emissions test, you'll need it.
jory
11-02-2009, 09:04 PM
I say get a 2.5 inch downpipe, it will fit your turbo if you do a little grinding on the flange thing where the bolts go through.
Mopar318
11-03-2009, 03:46 AM
how can i get the o.d. on the pipe with it attached :confused:

Calipers
tsiconquest88
12-02-2009, 12:23 AM
haha WOW i love that answer, i put up a post just like his today with the same exact issue of not wanting to take it apart, i have digital calipers in my tool box and didnt even think to use them hahahahaah WOW.