Downpipe stepdown restriction?

[thom337]

http://photos-362.facebook.com/ip006/v23/139/92/6220362/n6220362_30970362_4252.jpg
The downpipe on the bottom is the one I have now. I'm planning on getting a 2.5 catback system sometime in mid July, but I'm not sure its gonna be to grand w/ my current downpipe. As you can see in the picture, the downpipe is 3 inch, then a stepdown to 2.5 inch, then a stepdown to 2.25 to fit the stock catback. I'm thinking that 2.25 section is probably gonna ruin my exhaust flow and pretty much negate the purpose of getting a 2.5 catback.
So, I'm thinking I can either try to find a test pipe section that its full 3 inch or I can cut the one I have now at the first stepdown and weld on some 3 inch piping so its full 3 inch. So my question being, does anyone know anyone who might sell a testpipe thats full 3 inch or maybe 3 inch to 2.5 and/or does anyone have a welder/know of a place that could do it for cheap?
On a side note, who all is running eBay intercooler set ups? I'm kind of considering doing that later in the summer, I think for now I'm just gonna try and rig up something to help my side mount flow better. I'd like to hear how that worked for ya/ if you retained your DV or went to a recirculating BOV.

[dekroon]

Just cut the 2.25 section of the test pipe off.

Then you would just need a sleeve(section of 2.5") to go to the new cat-back section.

GHL makes downpipe reducers for going from 3" to 2.5 they run around 30 for the stainless bits....

[Vampire Cockroach]

Thomas; do you have this stepdown pipe still?

I'd be willing to trade the stepdown for a straight 3" section...


*this applies to anyone in the forum who has this same pipe*

[a4wdhybrid]

i have about a 14" section of 3" exhaust tubing if you need it

and quit bs'ing and just install the front mount

[thom337]

Haha, don't worry Ian, its my first priority right now...this thread is from over a month ago. Helke, you are in quite the bring threads back from the dead mood today ha.
As for this exhaust stuff...is your 3 inch pipe flanged like mine is (Helke)? I guess i could make it work either way, but just checking. I might not being doing this for a while btw, my recent front mount purchase put me in the hole pretty good, so I probably won't be messing w/ the exhaust till I can afford a cat-back (or lack therof) system.

[Vampire Cockroach]

yeah mine has the 3-bolt flange as well.

btw check your pm's

[thom337]

yeah mine has the 3-bolt flange as well.

btw check your pm's

Cool, I will probably be interested if you can put some pics up. Although, I might not be able to do it at least till I get all my FMIC crap sorted out...its a bit more involved than I forsaw. Oh yeah, and I PMed ya back :oddeye-hellyeah:

[j_sonel]

Are you going to run Cat-less? I didn't see any mention of a new one.

Am I incorrect in my assumption that a Cat-Back does not include the Cat? :confused:

[Vampire Cockroach]

Cool, I will probably be interested if you can put some pics up. Although, I might not be able to do it at least till I get all my FMIC crap sorted out...its a bit more involved than I forsaw. Oh yeah, and I PMed ya back :oddeye-hellyeah:

We could do both the same day if you like... my place is open to work at if you want somewhere to go

[thom337]

Are you going to run Cat-less? I didn't see any mention of a new one.

Am I incorrect in my assumption that a Cat-Back does not include the Cat? :confused:

Yep I've been running catless for over a month now, and I love smelling like a gokart. :yum:

Helke: I'll be on the lookout in the next few days for a 3inch to 2.25 adapter, last I checked at some local auto parts stores, I could only find 2.5 to 2.25, but I'll check again. Oh, and does your 3 inch pipe have an 02 sensor bung?

[a4wdhybrid]

very unlikely youre going to find a 3" > 2.25" adapter in a parts store anywhere around here

[thom337]

very unlikely youre going to find a 3" > 2.25" adapter in a parts store anywhere around here

Yeah, I've never seen one.... just 2.5 to 2.25

[a4wdhybrid]

summit racing, jegs, ebay...or im sure there are many other places

[Vampire Cockroach]

Yep I've been running catless for over a month now, and I love smelling like a gokart. :yum:

Helke: I'll be on the lookout in the next few days for a 3inch to 2.25 adapter, last I checked at some local auto parts stores, I could only find 2.5 to 2.25, but I'll check again. Oh, and does your 3 inch pipe have an 02 sensor bung?

Yes it does have the rear O2 sensor bung, and I actually also have a 3"- 2.25" adapter that i could throw in the trade