Which downpipe?

E-Rock · 06-23-2008, 06:07 PM

Hey everyone

I'm looking into getting a downpipe so I can finally go stage 2.

All I have as far as mods go is a GReddy Ti-C exhaust and a Cobb AP.

Now I have an 07 STI and have heard that most tuners recommend a catted DP with the 07's due to some tuning issues. That is fine with me as I'm not looking for every single last hp out of my set up. But my question is what downpipe should I get? I need it to fit the catback I have and I need it to not be too expensive lol. Are there any suggestions?

Thanks

**Cr8zyJAP07** · 06-23-2008, 06:12 PM

INVIDIA

i have invidia v2 catless dp having no probs. catted is like $200 more than catless.

Icculus · 06-23-2008, 08:43 PM

This might at least help you out with which brands will have the correct flange for your cat back

Comprehensive Exhaust Sizing Thread (or soon to be so!)

sti_schumacher · 06-23-2008, 09:04 PM

helix is the cheaper one, though they are the same quality as invidia. your exhaust fits the helix for sure - the site (bottom link) offers the DP with the greddy exhaust as a bundle.

here's a site with the helix DP - they offer free shipping. though i dunno about the pricing - you may be able to find a cheaper site, cause these guys just increased their prices (at least for the helix DPs) by 50 bucks

:

Impreza Exhaust

E-Rock · 07-23-2008, 06:42 PM

Sorry i haven't updated this for a while but i haven't had the money to get a downpipe til now and after a lotta research i am more confused than ever. Does anyone know whether the MadDad Metal Bellmouth (MadDad(TM) Metal Bellmouth Downpipe :: Downpipes :: Exhausts :: Daddy's Sport Compact Performance) downpipe will fit the Greddy Ti-C? I've read that MadDad is great quality and no fitment issues. And 450 for a catted downpipe isn't too bad. So I just want to make sure that this will fit my exhaust?

And if it doesn't, I guess I'll order a Helix catted for something like 350 since people have said it usually fits.

lapinga · 07-23-2008, 06:43 PM

invidia v2 +1

Icculus · 07-23-2008, 06:52 PM

Quote:

Originally Posted by E-Rock

Sorry i haven't updated this for a while but i haven't had the money to get a downpipe til now and after a lotta research i am more confused than ever. Does anyone know whether the MadDad Metal Bellmouth (MadDad(TM) Metal Bellmouth Downpipe :: Downpipes :: Exhausts :: Daddy's Sport Compact Performance) downpipe will fit the Greddy Ti-C? I've read that MadDad is great quality and no fitment issues. And 450 for a catted downpipe isn't too bad. So I just want to make sure that this will fit my exhaust?

And if it doesn't, I guess I'll order a Helix catted for something like 350 since people have said it usually fits.

I'm going to go out on a limb and say no but please someone correct me if I'm wrong. I'm GUESSING that since you're currently running the Greddy Ti-C and factory down pipe that the Greddy necks down to 2.5" and uses the factory donut gasket where it connects to the dp. The downpipe you listed above uses a 3" flange. Maddad sells another 2 piece dp
MadDad(TM) Metal V2 two-piece Downpipe :: Downpipes :: Exhausts :: Daddy's Sport Compact Performance
that you can use the donut gasket. Or another suggestion would be the cobb. Hope this helps

EDIT: It really all boils down to how the dp's and the catback connect to one other. There are 2 possible options--factory donut gasket (exhausts and catbacks that neck down where they connect to 2.5") and those that use a 3" flat flange. Most websites will say or the picture of the dp should make it obvious if it will work or not and you can shop with confidence

. Please verify that your specific Greddy uses the donut though as thats the one part i'm not sure about.

sti_schumacher · 07-23-2008, 07:19 PM

scratch that - they've upped their prices by 50 bucks, but its still pretty good...

Quote:

Originally Posted by sti_schumacher

helix is the cheaper one, though they are the same quality as invidia. your exhaust fits the helix for sure - the site (bottom link) offers the DP with the greddy exhaust as a bundle.

here's a site with the helix DP - they offer free shipping. though i dunno about the pricing - you may be able to find a cheaper site, cause these guys just increased their prices (at least for the helix DPs) by 50 bucks

:

Impreza Exhaust

E-Rock · 07-24-2008, 02:45 PM

Yeah thats the thing i dont know if mine is 2.5 or not.. its not a perfect seal against the stock downpipe but its not really that big of an opening either not a .5 inch opening

***Turbineguy*** · 07-24-2008, 03:02 PM

FWIW I've been running an Injen catless for almost 2 years now bolted up to a Greddy Evo2. Never had any issues and they bolt up fine. I believe they have a catted one as well.

Icculus · 07-24-2008, 06:31 PM

Quote:

Originally Posted by E-Rock

Yeah thats the thing i dont know if mine is 2.5 or not.. its not a perfect seal against the stock downpipe but its not really that big of an opening either not a .5 inch opening

Is the bottom one your exhaust?
GReddy 02-07 WRX & STi EVO 2 & TI-C Catback Exhausts,WRX & STi Exhaust from JSC Speed
If so then it looks like it tapers and re-uses the donut gasket and you need to go with a dp that does the same (i.e. the 2-piece maddad, cobb, or other). Anytime some one who actually owns this cat back and wants to chime in and confirm what I'm saying, that would be awesome...but I'm pretty sure I'm right

EDIT: Since you mentioned maddad specifically I'm assuming you liked it and I've read nothing but good things about their products (haven't personally owned--but scoping out their headers). I'm sure if you just gave them a call or shot them an email they could confirm for you 100%

***VSGTS14*** · 07-24-2008, 06:33 PM

i have an invidia v3 for sale.

06-23-2008, 06:07 PM	#1
E-Rock Amateur STI Driver Car: 07 SWP/Gold STI Location: Central Jersey (Home) / U Posts: 21 Join Date: Apr 2007 Trader Rating: (0)	Which downpipe? Hey everyone I'm looking into getting a downpipe so I can finally go stage 2. All I have as far as mods go is a GReddy Ti-C exhaust and a Cobb AP. Now I have an 07 STI and have heard that most tuners recommend a catted DP with the 07's due to some tuning issues. That is fine with me as I'm not looking for every single last hp out of my set up. But my question is what downpipe should I get? I need it to fit the catback I have and I need it to not be too expensive lol. Are there any suggestions? Thanks This ad is not endorsed by this member. Please register or login to hide this ad.

06-23-2008, 06:12 PM	#2
Cr8zyJAP07 Gold Member Car: 07 STI OBP Fav Mod: 57maximum t/a, Nur spec-R, invidia v2.... Location: Bushkill, PA Posts: 1,031 Join Date: Feb 2008 Trader Rating: (3)	Re: Which downpipe? INVIDIA i have invidia v2 catless dp having no probs. catted is like $200 more than catless.

06-23-2008, 08:43 PM	#3
Icculus Silver Member Car: 07 SWP STi Fav Mod: AP Location: Asheville, NC Posts: 482 Join Date: Oct 2007 Trader Rating: (5)	Re: Which downpipe? This might at least help you out with which brands will have the correct flange for your cat back Comprehensive Exhaust Sizing Thread (or soon to be so!)

06-23-2008, 09:04 PM	#4
sti_schumacher Junior STI Driver Car: 04 WRX 'blk prl' STi Fav Mod: Injen CAI w/ used filter :D Location: Toronto, ON Posts: 173 Join Date: Mar 2008 Trader Rating: (1)	Re: Which downpipe? helix is the cheaper one, though they are the same quality as invidia. your exhaust fits the helix for sure - the site (bottom link) offers the DP with the greddy exhaust as a bundle. here's a site with the helix DP - they offer free shipping. though i dunno about the pricing - you may be able to find a cheaper site, cause these guys just increased their prices (at least for the helix DPs) by 50 bucks: Impreza Exhaust

07-23-2008, 06:42 PM	#5
E-Rock Amateur STI Driver Car: 07 SWP/Gold STI Location: Central Jersey (Home) / U Posts: 21 Join Date: Apr 2007 Trader Rating: (0)	Re: Which downpipe? Sorry i haven't updated this for a while but i haven't had the money to get a downpipe til now and after a lotta research i am more confused than ever. Does anyone know whether the MadDad Metal Bellmouth (MadDad(TM) Metal Bellmouth Downpipe :: Downpipes :: Exhausts :: Daddy's Sport Compact Performance) downpipe will fit the Greddy Ti-C? I've read that MadDad is great quality and no fitment issues. And 450 for a catted downpipe isn't too bad. So I just want to make sure that this will fit my exhaust? And if it doesn't, I guess I'll order a Helix catted for something like 350 since people have said it usually fits.

07-23-2008, 06:43 PM	#6
lapinga Junior STI Driver Car: 04 WRB sti Location: GA Posts: 106 Join Date: Apr 2007 Trader Rating: (0)	Re: Which downpipe? invidia v2 +1

07-24-2008, 02:45 PM	#9
E-Rock Amateur STI Driver Car: 07 SWP/Gold STI Location: Central Jersey (Home) / U Posts: 21 Join Date: Apr 2007 Trader Rating: (0)	Re: Which downpipe? Yeah thats the thing i dont know if mine is 2.5 or not.. its not a perfect seal against the stock downpipe but its not really that big of an opening either not a .5 inch opening

07-24-2008, 03:02 PM	#10
*Turbineguy* Non-Reformed Meth Addict Car: '06 WRB Fav Mod: A laptop and tuning software. Location: Swampbilly Central Posts: 2,387 Join Date: Feb 2006 Trader Rating: (8)	Re: Which downpipe? FWIW I've been running an Injen catless for almost 2 years now bolted up to a Greddy Evo2. Never had any issues and they bolt up fine. I believe they have a catted one as well.

07-24-2008, 06:33 PM	#12
*VSGTS14* Muller Chevrolet Car: 08 Chevy 2500HD Fav Mod: a new 08 STi Location: Milford, NJ Posts: 9,990 Join Date: Oct 2004 Trader Rating: (11)	Re: Which downpipe? i have an invidia v3 for sale. This ad is not endorsed by this member. Please register or login to hide this ad.