Marcello7x

iTrader: (10)

Ok here is the planned setup for my 404ci w/ supervic, afr225, and not to wild pat g cam.


1 7/8 custom lt headers to 3.5" collector
3.5" piping for about 2.5ft with a cutout to a boom tube
3.5" to 2.5" reducer
2.5" dynomax superturbo mufflers[longer version]
then merged into the side of the boom tube

This is per side, i currently do not have a X or H installed. If i do, i will only have space for it post cutout pre boom tube, or possibly post muffler.

Marcello7x

iTrader: (10)

Starting to worry that 3.5" is overkill. I figure the reduction to 2.5" capped would be fine, but onces i uncap and bypass the 2.5" im going to loose too much torque. A little loss is acceptable since im overpowered and under-weighted, but too much is a NO NO.

mean_greenZ

iTrader: (1)

Maybe I'm reading this wrong but that sounds like a lot of stuff to try and fit under an f-body. As far the size I think 3" duals would be sufficient. The H or X placement needs to be closer to the headers than where you are talking about placing it for it to work best.

TImmy_Jones

iTrader: (4)

2.5" duals all the way back is plenty, its been proven over and over. Unless you are over 500RWHP, don't worry about it.

Marcello7x

iTrader: (10)

Its not under an fbody....33 ford coupe with a custom frame.

Engine should put out 500rwhp all motor+ 150-200 shot.

Marcello7x

iTrader: (10)

Here is a pic of the plan. The height of the oval tubing is 2.5 so i will merge into that with a custom merge.

mean_greenZ

iTrader: (1)

Ok gotcha... looks like a slick setup! I see no problem with it being 2.5" through the mufflers with the cutouts closed since your purpose for that is to be quiet. The 2.5" tubing will help muffle it a little more too. As far as the pipes going to the boom tubes I think 3" would be plenty and may save you some room but if you already have it planned out for 3.5" I don't see it hurting hp/tq. too much. The 3.5" pipe will make it sound a little deeper.

Steve Gunn

I think you would be restricting that many cubes with those heads and nitrous with anything less than 3. I vote for 4.

Marcello7x

iTrader: (10)

I figured the same at first, but with a collector for 1 7/8 being 3.5" it lead me to believe i should stick to 3.5". Once i ordered the parts and held some 3.5" piping in my hand i nearly **** myself on how much bigger it was than i anticipated.

So you think i should run dual 4" pipes??? My concern was 3.5" was too big to begin with.

Steve Gunn

Reducing to a 3" would be fine if space is a problem. I'm just partial to the exhaust note of a larger pipe. I think the gains would be minimal.

Marcello7x

iTrader: (10)

I should be able to fit 3.5" as everything sits now. My original plan was cutouts directly post collectors, but i had major clearance issuse. The flange was 3" from the ground with 17" rims, and im going down to 16" and possibly a lower pro tire.


What is the setup for you 4" cutout? Is it a 4" off a Y pipe?

Marcello7x

iTrader: (10)

Anyone else have an opinion, i would like to order by lunch time....

Marcello7x

iTrader: (10)

So far the list is:

Header alignment sleeves.
pypes universal 3.5" x pipe kit
3.5" flange kit
2 2.5" flange kits
1 2.5" u bend to make the muffler to oval merger

Marcello7x

iTrader: (10)

placed my order a few hours ago, i'll post a sound clip on my build thread if anyone wants to hear it.

https://ls1tech.com/forums/conversio...ker-build.html

Marcello7x

iTrader: (10)

Pypes X pipe kit came in, first impressions its good quality stuff. Check out the build thread for for pics and more info as i install and so on.

Marcello7x

iTrader: (10)

Here is a quick mock up pic, cutouts will be post X pipe instead of pre. It will allow the X pipe to work as an H while cutouts are closed.