exhausting

[dsmodder]

anybody know if you can hook up a ported 1g manifold with a ported evo 8 O2 housing and an apexi n1 downpipe on a 2g gsx with a 7 bolt but soon will be swapped for a 6 bolt. and any suggestions to anything that would work better than that set up.

[kjewer1]

That will all work. The 1g manifold is a piece though, I would suggest the 2g or EVO3.

[dsmodder]

yea i was looking at slowboy and i think i will go with a evo mani stage 2 ported it looked fuckin sweet

[scottsee]

i am really really sure i read somewhere the evo o2 housing & n1 downpipe dont match up!!

[kjewer1]

The N1 DP must not have slotted holes then. Actually I should know that, I use Apexi flanges all over my exhaust You will need to slot the holes in the flange.

RRE offers a DP made specifically to mate with the EVO3 O2 housing. Its about 230 bucks, so it may save you some coin too. The angle is also changed slightly so it clears your oil pan. Now that scotsee made me think about it, I would only run the RRE downpipe with the EVO3 O2...

Wait a minute..., What catback are you going to use? If it has a full 3" flange the RRE DP will bolt right up. If it goes back to the shyte stock sized flange (bolts to stock cat) your hosed.

[dsmodder]

i was gonna have a shop customize the rest of my exhaust from the downpipe back. probly use the n1 muffler. but i think the apexi n1 exhaust does have a 3" flange right? also will the evo manifold bolt up to both a 7bolt and 6 bolt because i want to swap this set up over to my 6 bolt when i get it.

[dsmodder]

nevermind i found all that on the RRE site. the apexi n1 does bolt up to the RRE downpipe and the evo mani botls up to the 7 botl and requires a little trim to fit the 6 bolt. anohter question though... what determines whether you need to use an external wastegate or internal??????

[JoeWagon]

Originally Posted by dsmodder

the apexi n1 does bolt up to the RRE downpipe

Yep, I think all Apexi 3'' catbacks use the same flange, which is what the RRE downpipes use. If you are going to use a custom catback and an N1 muffler, just make sure to buy the flange, which is available from RRE somewhere in the DIY Exhaust sections...

Originally Posted by dsmodder

anohter question though... what determines whether you need to use an external wastegate or internal??????

The turbo will make your decision as to which wastegate to use. You can use an internal wastegate on bigger turbos such as 50 trim Garrett's, but an external wastegate is going to give much better boost control on 20g/50 trim turbos and larger. What turbo do you want, and how much boost do you want to run? You almost have to read about all the wastegate quirks, like that you'll get boost creep trying to run low psi on an EVO3 16G with the regular flapper, but if you get the larger flapper you may not be able to run lower boost because it flies open...

Best to be specific with the turbo and make sure someone like Kevin gives it the OK

[dsmodder]

right on joe. im addicted to this forum cuz i learn so much. i want to go with the 20 g. and run around 17 or so psi all the time as a DD. buying hte flange from RRE and doing it custom will be a lot cheaper so im gonan do that. thanks for all the help with this and have a good 4th of july. im gonna blow some shit up right now and pretend its some terrorists. AMErica OWNS THEM

[JoeWagon]

As for the custom stuff, I hope you have looked into buying the mandrel bends from RRE or jcwhitney instead of having them press bend the pipe.

[dsmodder]

so basically ask RRE for eveyrthing i will need from their dp back and just have a custom shop weld it up for me. sounds better than guessing and hoping and im sure RRE would know. thanks agian for the help

[kjewer1]

If you search on RKO you can find a list of the parts I used on my exhaust. A 3" apexi flange, a straight section of 3" tubing (5 feet is just enough), 2 3" 45s, and the muffler. Thats it. Its all welded up, with one small crush bent "adjustment."

[dsmodder]

what is RKO? never heard of it. sounds like a plan tho.

[kjewer1]

Oh yeah, that would help. Used to be in my sig www.racingknowledge.org. Very slow lately, but there is still some good stuff like this in the archives...

[dsmodder]

right on. by the way how did you (gsxracer) learn so much about dsms? experience? or do you work at a shop or what