dp help
dp help
ok so make fun of me if you want, but whats the diameter of the stock dp?
come on really? no one knows the size of stock downpipe? im tryin to order a cutout people please help asap!
come on really? no one knows the size of stock downpipe? im tryin to order a cutout people please help asap!
Last edited by corey_osu10; Jun 28, 2010 at 12:20 AM. Reason: Automerged Doublepost
Senior Member
Joined: 03-16-09
Posts: 6,205
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From: tennessee
Search bro. 
2.20" Inner diameter at the front flange off the header
2.50" Outter diameter at the flex-joint.
2.75" OD front/rear of cat.
2.40-2.45" at 02 sensor bung.
I think dats it yo. You can wait for others to be sure.
2.20" Inner diameter at the front flange off the header
2.50" Outter diameter at the flex-joint.
2.75" OD front/rear of cat.
2.40-2.45" at 02 sensor bung.
I think dats it yo. You can wait for others to be sure.
Joined: 12-30-07
Posts: 14,079
Likes: 197
From: NEPA
2.250" I.D. @ 3-bolt entrance flange
2.785" O.D. Front/rear of cat, and a portion after rear 02 sensor
2.250" dimpled portion for rear 02 sensor
2.354" O.D. neck down portion before 2-bolt exit flange
Joined: 12-30-07
Posts: 14,079
Likes: 197
From: NEPA
ok so if im going to cut out the section where the originaly 02 is and have the y pipe welded in there then i should order a 3 inch cutout and 3 inch y pipe and it can be welded in without an issue on the pipe since its 2.785? or should i get a 2.5 and have it flared? im not the greatest on this subject. thanks for the help guys
New Member
Joined: 04-26-10
Posts: 146
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From: Michigan
thanks! i really would like to buy it but someday id like to run a 3" exhaust but right now i currently dont have the cash to do so. I have the cash to buy a down pipe but don't want to buy the 3" in and 2.5" out because it would be a waste of money right? The 3" in and out would not fit now?
Joined: 12-30-07
Posts: 14,079
Likes: 197
From: NEPA
thanks! i really would like to buy it but someday id like to run a 3" exhaust but right now i currently dont have the cash to do so. I have the cash to buy a down pipe but don't want to buy the 3" in and 2.5" out because it would be a waste of money right? The 3" in and out would not fit now?
If you are still on the stock catback you will need to get the 3" downpipe with 2.5" exit.
New Member
Joined: 04-26-10
Posts: 146
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From: Michigan
idk if you would know this but ill ask anyway. how much do you think muffler man would charge me to run 3" pipe from my downpipe and reduce it back down to 2.5" inch right at my muffler (so i dont have to buy a new muffler).
Joined: 12-30-07
Posts: 14,079
Likes: 197
From: NEPA
I only see one prob with this. The stock lsj catback necks down to 2.25" o.d. over the rear axle and into the muffler. You could just have them replace the 2.50" portion from the downpipe exit to right before the rear axle. I don't think it would be to expensive, but then you are left with a little 2.25" rear section. You are better off waiting and getting a full 3" catback.
New Member
Joined: 04-26-10
Posts: 146
Likes: 0
From: Michigan
I only see one prob with this. The stock lsj catback necks down to 2.25" o.d. over the rear axle and into the muffler. You could just have them replace the 2.50" portion from the downpipe exit to right before the rear axle. I don't think it would be to expensive, but then you are left with a little 2.25" rear section. You are better off waiting and getting a full 3" catback.
thanks