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Old 10-31-2007, 03:47 AM   #1
si12j12
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Default flat flange dp vs bellmouth vs divorced ... power gains?

I have 04 wrx and Im planing on going stage 2 i currently at stage 1 with b&b catback . Im thinking i will probably be stuck at stage 2 until i get turbo and supporting mods ,my question is ,will i see noticeable power with a dp that is divorced or bellmouth compared to flat flange type dp like hks ?

I would be running the stage 2 generic map from cobb until i get tunned , Im looking for dp but not shure if gains will be much to invest on a more expensive dp like cobb or just buy a cheap hks dp?

Any input would be greatly apreaciated
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Old 10-31-2007, 07:13 AM   #2
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At Stage 2 levels, you won't notice a power difference between flat plate/BM/DWG pipes.

But since you're already thinking turbo swap, go ahead and buy a BM or DWG. If you want LOUD turbo spooling noises, get the DWG.
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Old 10-31-2007, 09:52 AM   #3
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I believe that COBB tuned the stage 2 map using a Bellmouth DP so your better off going with that. I did check the website and didn't see that noted in the map notes, but I thought I read that somewhere.
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Old 10-31-2007, 12:54 PM   #4
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...there is a HUGE difference in 'power gains' and throttle response....and most of the 'power gains' that a good DW dp are made below where the vast majority of dyno d000ds start their pulls, anyway


there is good resaon that so many of the top companies...like Prodrive and APS make DW dp's

ya want a drag car....get the TXS bellmouth

ya doin an EW...get the hks

ya doin an IWG street car and DD it......
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Old 10-31-2007, 01:23 PM   #5
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Quote:
Originally Posted by Uncle Scotty View Post
...there is a HUGE difference in 'power gains' and throttle response....and most of the 'power gains' that a good DW dp are made below where the vast majority of dyno d000ds start their pulls, anyway


there is good resaon that so many of the top companies...like Prodrive and APS make DW dp's

ya want a drag car....get the TXS bellmouth

ya doin an EW...get the hks

ya doin an IWG street car and DD it......
what does EW ,IWG and DD mean??
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Old 10-31-2007, 01:47 PM   #6
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Quote:
Originally Posted by AMG Eater View Post
what does EW ,IWG and DD mean??
pretty sure this is what it means

ew- external wastegate
iwg- internal wastegate
dd- divorced downpipe

frankly, it all depends on what route you are going, if your running external wastegate, go with hks and if your running a bigger than 20g turbo, id say go with the aps downpipe, one of the best divorced downpipes out their.
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Old 10-31-2007, 05:45 PM   #7
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So, unless you a running a bigger than stock turbo...you won't see much differance between a flat plate dp to bellmouth or divorced????
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Old 10-31-2007, 07:10 PM   #8
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the biggest difference would be between a flat plate and either a bellmouth or divorced. Just buy a good used divorced or bellmouth and call it good. Unless you're trying to pull out every last bit of power and running huge turbos then the bellmouth vs divorced design isn't a big deal.
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Old 10-31-2007, 08:19 PM   #9
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just go EWG!
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Old 10-31-2007, 08:49 PM   #10
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^
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Old 10-31-2007, 10:00 PM   #11
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ive been thinking and i really just want to stay at a reliable stage 2 for the moment , i think i might just buy a used dp like helix or titek or something like that , and get a tune . But ewg will def be something i would want in the near future.
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Old 11-01-2007, 12:32 AM   #12
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...and if you go DWG, I'd strongly recommend the Crucial unit. Beeyootifull piece w/great fitment. I've never been anything but ecstatic with their stuff.
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Old 11-01-2007, 01:22 AM   #13
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Or Maddad. Mine is perfection.
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