I have a 99Si with a B16 motor, and will be running an Inline Pro manifold, and SC34 turbo. I will have a revhard 2.5" downpipe. I want to run 400+whp, so i was thinking about running the 2.5" till it passes the AC compressor cause i want to keep AC, and then flare it out to 3" and 3" all the way back. By doing this will it allow be to run bigger numbers with no problems? or because of that foot and 1/2 of 2.5" will it still cause too much restriction. Yeah i know 3" is the best and thats what i want, if SOMEONE can sell me one that will work hey im down for a good price. Will i have to buy a new 5 bolt flange for a 3" pipe? i was thinkin a vband steup for that.

Ohh yeah... will this DP work for when i put in the B18 block?

 

im wondering the same thing about 2.5-3" DP. please advise us..

 

Just flare it out after the a/c compressor. Here's what i did for wrestler121's inlinepro downpipe


pic of the stainless 3" flare i used

 

I dont have pics of mine, but Im runniing the same setup sc34 turbo, inline pro, Revhard downpipe.

Heres what I did I bought a Revhard DP from Tony1, bought a 2.5-3" flare, bought a 3" flex pipe from b18flip , and I bought 10-12" on straight pipt from Tony.

To keep it simple I just had him cut DP after it made it's curve and headed toward rear of car(right before Oil pan) then added in flex section, then about 12" of straight to connect directly with the exhuast.

Basically we used the Revhard as a Premade halfway Dp and just worked off that .

 

i have been considering this too, anyone have more pics ???

also could any muffler shop do this?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18Flip &raquo;</TD></TR><TR><TD CLASS="quote">Just flare it out after the a/c compressor. Here's what i did for wrestler121's inlinepro downpipe


pic of the stainless 3" flare i used
</TD></TR></TABLE>


Damn mayn, if I woulda knew u do crazy welding like that, I woulda bought a downpipe from ya

 

Similar to others I have AC and I'm using the existing 2.5" Maxrev downpipe that bolts onto the turbine and straight after the bend (after the AC compressor), we cut it and made a 2.5"-3" flare and its all 3" from there, flexpipe and down to muffler straight through. The difference is AWESOME to say the least!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by integranator &raquo;</TD></TR><TR><TD CLASS="quote">
Damn mayn, if I woulda knew u do crazy welding like that, I woulda bought a downpipe from ya </TD></TR></TABLE>

lol yeah i make them on the side when i have time away from school and work
but i do have a few 304L stainless flares like in the pic above if you guys are interested in making your own.....hit me up w/ a pm

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1SlowSi &raquo;</TD></TR><TR><TD CLASS="quote">

Ohh yeah... will this DP work for when i put in the B18 block?</TD></TR></TABLE>

it should work ok, the only thing is that the b16a blocks are a few mm shorter than the b18's so you may have to pound on the oil pan a bit if it hits it.

 

I'll be using a Lovefab SST mani, Precision SC50 and 2.5"-3" flare on my downpipe. Hoping to make around 350whp with it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 &raquo;</TD></TR><TR><TD CLASS="quote">I'll be using a Lovefab SST mani, Precision SC50 and 2.5"-3" flare on my downpipe. Hoping to make around 350whp with it.</TD></TR></TABLE>

sounds like a nice setup, i think elspool is running a similar setup......with a/c too

 

well this helps me alot. thanks guys.

 

Damn 1SlowSi, all your Topics posted. Sounds good! I also needed to know these things. -=P gOod thinking.

Sounds like an idea to start from.

 

b18flip--- do you need the manifold to make DP's

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b18bEG &raquo;</TD></TR><TR><TD CLASS="quote">b18flip--- do you need the manifold to make DP's</TD></TR></TABLE>

hes a good guy, i sent him my mani/turbo and he made ma custom dp

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b18bEG &raquo;</TD></TR><TR><TD CLASS="quote">b18flip--- do you need the manifold to make DP's</TD></TR></TABLE>

If its a revhard/inlinepro manifold setup i wont need it, but if its anything else i'd need the manifold

proeater had sent me his since i didnt have access to an si greddy kit. Although i was able to make a ghetto mock up so i can do those to

BTW here's his 2.5" to 3" flared Greddy downpipe




Modified by B18Flip at 5:40 PM 2/12/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic200 &raquo;</TD></TR><TR><TD CLASS="quote">

I'll be using a Lovefab SST mani, Precision SC50 and 2.5"-3" flare on my downpipe. Hoping to make around 350whp with it.</TD></TR></TABLE>


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18Flip &raquo;</TD></TR><TR><TD CLASS="quote">

sounds like a nice setup, i think elspool is running a similar setup......with a/c too </TD></TR></TABLE>

Identical set up!

 

Does the dumptube just end there or did you eventually route it back into the exhaust?

 

how much more hp would the flare make?

 

Get one of these units HERE

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Davep &raquo;</TD></TR><TR><TD CLASS="quote">Get one of these units HERE</TD></TR></TABLE>

yup, those pieces are good. They're a bit shorter, cheaper and are machined from mild steel ....i opted for the 304L stainless piece for bling

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by g5r &raquo;</TD></TR><TR><TD CLASS="quote">how much more hp would the flare make?</TD></TR></TABLE>
not really sure, i've never seen a dyno comparison but it should help a bit w/ spool time. I think another member posted that it made a big difference compared to his 2.5" DP

 

I wanted one out of 304SS but they don't offer one it so I did the mild steel. Here is my 304 SS 3" downpipe w/LoveFab manifold... This is for a buddys car not mine.

 

y not just str8 3" all the way? wouldnt the 2.5 congest the air flow.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ELSpool &raquo;</TD></TR><TR><TD CLASS="quote">


Identical set up! </TD></TR></TABLE>

Sweet.
What motor? Mine is going on D16Y8 with SRP pistons/Eagle rods.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 &raquo;</TD></TR><TR><TD CLASS="quote">

Sweet.
What motor? Mine is going on D16Y8 with SRP pistons/Eagle rods.</TD></TR></TABLE>

Same thing. 9.0 SRP/Eagle rods, just saw my block all done this morning.
here is my SC-50 on the right, the 61 on the left...
http://www.tappauto.com/carpics/turbos.JPG
And my engine way in the back!
http://www.tappauto.com/carpics/engines.JPG

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Davep &raquo;</TD></TR><TR><TD CLASS="quote">I wanted one out of 304SS but they don't offer one it so I did the mild steel. Here is my 304 SS 3" downpipe w/LoveFab manifold... This is for a buddys car not mine.
</TD></TR></TABLE>

That looks awesome Dave