Longtubes

Reply Subscribe

Thread Tools

Search this Thread

Oct 7, 2010 | 07:50 PM

#31

Chris05

TECH Resident

Joined: Aug 2008

Posts: 842

Likes: 0

From: East of the east bay CA

Quote:

Originally Posted by Steve-O-08

sweet, well I think I should definitely be alright as far as clearance goes with my truck being 2WD. I am just trying to figure out how I'm going to cat an off road y pipe. stupid smog... is there anOBX Y with out cats? I was looking at the kits for the avalanche and they are pretty much all the same pics for every kit. I am probably gonna find another Y and do some cuttin and weldin to make it all work.

You could buy the dynatech y-pipe with high flow cats. It's a bit pricey though, or have some cats welded to the obx y-pipe before you install it.

Oct 7, 2010 | 07:55 PM

#32

DV2000NJ

13 Second Truck Club

iTrader: (10)

Joined: Nov 2009

Posts: 1,102

Likes: 1

From: Central NJ

Quote:

Originally Posted by 02'Z71ONDUBZ'

From the Ebay/OBX install write up...

"Some details/opinions...
Headers have 1-5/8" primary tubes, measured with dial caliper from inside, although advertised as 1-3/4"
Collectors and all piping is 2.5"...end of Y pipe is 3" and mates stock catback piping perfectly."

This is regarding the OBX headers that come with the y-pipe off ebay, just curious as to whether or not these are the same. Just so you know where I was coming from.

They're not the same. These are actually OBX branded headers, and when I first got them I remember measuring them and noting that they were larger than 1 5/8". I can't say for sure that they were 1 3/4" because I wasn't using calipers, but they looked to be on the tape measure.

Oct 8, 2010 | 02:32 PM

#33

rel3rd

11 Second Club

iTrader: (42)

Joined: Nov 2005

Posts: 1,643

Likes: 4

From: Baltimore, MD.

Quote:

Originally Posted by DV2000NJ

Not to mention there has been some debate (even on this site) as to exactly how primary header PIPE is measured. If you Google it, you'll see varying opinions as to whether a 1.75" header is measured from OUTSIDE or INSIDE of the actual pipe. When I measured by Ebay headers, as quoted above, I measured them from the INSIDE with very accurate reading caliper.

Some say headers are measured externally, and some say internally. All I could do is provide the internal measurement of the Ebay headers I bought.

Internally, the Ebay headers measured exactly 1.625", which is indeed 1-5/8".

Hope this helps...