mali_FC

Hey guys,

Few months ago I've got a RB header for my N/A, and I never had a chance to install it.

Recently I've heard that down pipe with pre-silencer is a better option than the headers (more power gains).

What is you personal experience on this?

thanx.

fcturbo2

Headers are for NA
DP are for Turbos..

No way you can install a DP in your NA FC..

BlaCkPlaGUE

I would disagree with what you've heard. However the downpipe versus the collected racing header from racing beat only offers MARGINAL difference with an NA. If you already have the collected header, stick with it. I don't believe that the RB header will bolt up to the stock cats on the seven, you will need a presilencer to bolt up to the stock y-pipe on the seven exhaust to make the headers work. At least thats how it was done on my car...

BlaCkPlaGUE

Welcome to the world of rotary exhaust manifolds. Your wrong, they take downpipes, they are not the same as a turbo in terms of length or bolt pattern, but they are defenitly downpipes that attach to the stock NA exhaust manifold. I know becuase I have a 3" one on my car right now with my NA manifold.

mali_FC

Couple fellows that I've met on social7 forum, told me that they have downpipes and presilencers on their NA's.

Maybe they are mixing apples and pears...?

TurboIIGuy

Liek FC turbo said " downpipes for turbo, headers for N/A"
AS for what Black plague said that post doesnt even makes sense...
I have a 87 T2.

Hey mali FC just got to racingbeat.com and look at pictures of the parts you are asking us about. Then you will see that its not posible to run headers or downpipes on the same car.
Totally not interchangeable.

At any rate.
If you street drive your car then you want a collected header to keep your low end power band alive.
The only FC N/a I ever had was a 88 GTU.
I put the racing beat road race headers on with a dual straight pipe, no presilencers. Yeah it was loud.
And with the duals all my power was above 4k rpm. It was crappy under that but I could take it to redline and it still felt good. But it depends on how you drive, are you always at redline or do you drive somewhat normally??

mali_FC

you are right on this one.....

I was thinking of getting a resonator and highflow cat attached to it...would it work?

fcturbo2

Blackplague..

mali_FC

I don't race it, but I drive fast though..hehe.
I change gears at 3.500...when I'm in the city.

gingenhagen

don't worry blackplague; i got your back.

racing beat donwpipe for n/a:

http://www.racingbeat.com/resultset....tNumber=S16206

mali_FC

here .....pics.

mali_FC

so, this is what they ment....

Now, is this better setup than the headers?

mali_FC

what other people think about it?

rotarygod

iTrader: (1)

I don't know how many out there have very poorly running cars but the difference between a down pipe and a header is night and day. Header all the way. It isn't even a comparison. The stock box manifold has no tuning done to it. It is for noise. A header actually tunes the exhaust and aids in scavenging. You will especially notice a header on the low to midrange.

1987RX7guy

iTrader: (3)

Yep.

N/a downpipe=teh suck

Headers is the best path.

KompressorLOgic

iTrader: (6)

header is allot better,

id recomend a collected header for simplicity and street driving...

you only gain a margional amount for having the road race header, and that adds alot of complexity to your exhaust system, as well as running 2 pipes all the way back will add more weight then the hp gain would make up for on a stock port car!!

no down pipe get rid of that cast iron brick manifold

staticguitar313

iTrader: (2)

i just skimmed through the thread so i'm not sure if anyones mentioned this, but Rotary Performance has a bonez high-flow cat that bolts up to the Racing Beat header and the y-pipe. I personally have the Bonez "downpipe" that has a presilencer into the high flow cat, into stock tii duals, gotta love it.probably will still run a bonez cat when i switch to the corksport or dual n1s when i finish the turbo setup. No porting = no use for headers.

BlaCkPlaGUE

Yea man, cause you know, I have no clue what im talking about

Jager

iTrader: (10)

I actually had the same Presilencer and Highflo cat from Bonez on my car. My cat-back was just stock with some big ricey mufflers. But anyways after I installed my headers I have to admit I did gain alot of power, not just off a butt dyno, but shaving time off at the track (like .6 fool!). Plus like it said before, it is 'tuned' and aids in scavanging. Which in effect gives you more HP. Also it reacts better with every mod you do, such as intake, porting, etc.

So I don't agree, witht he porting = no use for headers. Plus, why just buy something you'll replace anyways?

theman4444

*Legal in California only for racing vehicles which may never be used upon a highway.


Heh, that's funny. Kansas doesn't have emissions laws.

Sideways7

iTrader: (7)

I personally dont reccomend the bonez race pipe. The flanges are too thin and will warp over time and creat an unfixable exhaust leak.
Anyway, just keep the header and use it. It will prob give you power gains, and it eliminates a juction that I fouind to be somewhat weak and a general pain in the *** to get too - the junction between the dp and exhaust manifold. Also, if you dont have to have emmisions, just get the RB presilencer - it bolts up to the stock y-pipe or whatever catbacks you have.

TurboIIGuy

Now I understand....
I have always known these pipes as cat replacements....
Yeah they suck.
I ran straight pipe off a couple of stock manifold equipped cars in the past. They offer a very small amount of power increase.
The header is much better.

inflatablepets

Well, Racing beat recommends the downpipe if you are not doing any major fuel delivery/intake mods. It produces about the same result as the header without all the noise.

kanuk93gt

if you have headers, use them

BlaCkPlaGUE

EXACTLY. I mentioned that there isn't much difference unless your running alot more air than stock, such as a carb or a bridgeport with standalone. Not many people here are doing that so im surprized that they notice such a big difference. Maybe in low end torque, but thats about it I would think.