92hatchattack

Hey guys, I have a question.

Is the thermal 3" exhaust 3 inches OD or ID? I have the exahust but its not here with me. I ordered a 3" magnaflow cat and it just arrived. I also ordered some 3" butt joint band clamps from summit... the same ones that are holding my pieced together thermal exhaust now. Problem is, this cat is aparently 3" ID and in no shape or form do these same band clamps i have on my thermal fit around this magnaflow cat!

So is the thermal actualy 3" OD? Will is slip fit into the cat?

Thanks for the help guys.

418whpturboD

im almost positive the thermal is ID..

E85B18

The thermal is ID. A true 3"

JDMCRX

iTrader: (2)

I have the thermal 3" it is ID. but the muffler center section is 2.5" for 13".

I love mine all the joints over lap and it fit like a glove. And the sound is soo ****in nice. Ive done over 3 exhaust 3" on same sized cars and all sounded ricey.

I love mine and would not trade it for anything else.

92hatchattack

Have you guys actualy measured? I always thought it was true 3" too. But maybe its not... the piping is very thin. Acording to this link these guys measured with a mcirometer and get 3.006 OD and 2.856 ID...

http://www.turbomagazine.com/tech/01...ust/index.html

92hatchattack

Well in case anyone cares, it is true, the thermal is 3" OD and 2.85" ID ... it slips easily into my true 3" ID magnaflow cat.

berb_15

Wow a lot of people didn't do their hw before they posted... I also bought a 3" Magnaflow cat and it was convenient to slip the piping strait into it, I just clamped the one side and welded a flange to the other.

92hatchattack

what type of clamp did you use? Did yours fit snugly, or did it have a little play? Mine has a small amount of play and im wondering if a recular like c clamp will snug it up enough?

berb_15

I used a c type of clamp and it apears to be working fine. I didn't have too much play once I got the pipe about 1.5 inches in.

mar778c

iTrader: (1)

Get it welded if you want it to last.

supaslowdx

obviously anytime you can weld exhaust it will be stronger..weld ftw

berb_15

I had a welder when I built the rest of the exhaust but I decided to weld a flange on one side and clamp the other so I could remove it if I wanted (just didn't feel like waiting for more flanges to arrive and spending extra money on them). It's going to last just as long as if I had welded it, and strength is good but in the end it's an exhaust not a roll cage.

92hatchattack

Yeah, im not going o weld it yet because im not sure if i want it to last. LOL. Need to see if i can trap the same with it on at the track.

1qwkinline4

I don't have any pics or proof of this but i did run into this issue when I went to sell my 3"thermal off my teg. the guy brought a 3" piece of exhaust pipe with and thats when i realized i had this issue