Ok guys I am going to be modifing my 13B n/t over the winter for a good allaround driveable car and auto X car..

my question is I know I have an exhaust leak either the manifold gasket or something. so I will be replacing gaskets and such but I am curious shoudl I go with the Racing beat header or stick with the stock manifold?


currently I have the racing beat downpipe and a cheepo pre silencer which I will be replacing with a real Racing beat silencer, and I will keep the stock Y pipe but will be buying some HKS drag style strait through mufflers.
so I guess I am wondering should I stick with the stock manifold or should I go with a header?

my plans are, exhaust, cold air intake utilizing a air box shroud, possible intake porting job, pinneaple sleeves, removing the air pump, doing suspension, sway bars, rims and tires..

so what do u guys think?

Dave

 

Uh.... YES!?! That would have been the first thing I would have done. Youll get a quite noticeable increase in power.

 

seems like I read over at racing beat's webside to go downpipe and presilencer if you are staying fuel injected and go header and presilencer if you are going carb. I dont know the reason, that is just what they say.

 

that what I read to... and tanjo if u read I have not done anything above to my car yet those are my plans, all I have it sh downpipe and custom pre silencer cause it was cheep and I did not think I would use a header...

the idea behind a header on a n/a I would expect would be to loose low end gain high end right?

I just want to do it right.

 

I think that the fact that a downpipe is usually used when referring to a turbo car is getting forgotten here. For an NA car, it goes header, mid-pipe/presilencer, then the rest of your exhaust. Turbo cars have a downpipe instead of a header. And as far as losing low end power, your going to gain power everywhere. Its still a rotary, so your not going to have much down low power anyways.

 

actually if u look at racing beat site they still call the cat replacemtn pipe a downpipe..

I know what a downpipe is turbo or not (I am someone of a gear head when it comes to turbos)

but anywho so u think a header will be better on the n/a then the stock manifold

 

I have used the RB header on past N/A applications and I say go for it, without a doubt in my mind.

It is truly your call. You are currently using the N/A dp so why do you want to go full header? Because of the leak, I assume.

 

I had both the cat replacement pipe/presilencer combo + stock manifold & catback.

Then I opted for a RB header + presilencer + RB catback. Overall, I did NOT see a considerable gain with the header, as compared to just running their downpipe/presilencer combo. I did notice the exhaust was a bit louder, and maybe had a bit more top end "pull" but was nothing to scream at.

If you're going to be doing work in there anyway, you might as well just put a header on, if you've got the funds to do so. You could always re-sell the cat replacment pipe. Plus it is always nicer to have "full exhaust."

Have fun man, and you will be happy with all of Racing Beat's exhaust components, that's for sure. For the prices, you better be, lol. Really though, they make quality products.

James

 

Check out the RB webite. They call it a downpipe. Also, from what I have read, on a NA car, too little backpressure can cause a loss in low end power.

 

racingbeat only says you gain 1 hp with the header rather than the downpipe and it'll be alot louder

i have RB's downpipe and presilencer with corksport's catback on my 89 gxl and its really loud but it sounds nice, i wouldnt want it any louder for a daily driver for one extra horsepower

 

1 extra h/p after reading if my exhaust manifold is good I am just gonna keep that stock and go from there


Dave

 

Backpressure on any setup is ALWAYS bad. Period. Backpressure causes pumping losses and if you are seeing it early that means it will be a restriction up top in the RPM band.

The reason that torque is "lost" (its isnt, just moved) down low is because you have changed the flow characteristics of the engine. Now instead of reaching the manifolds most efficient flow point lower in the RPM band it reaches it in the higher rpm's. You power under the curve is almost always improved, so there is no loss of torque, just a shift of it.


BC

 

A header will have gains over just the downpipe, but mainly with a ported engine. With stock ports your are better off just keeping the downpipe you have. You might see some slight gains but not nearly enough to justify the cost of the header.

 

What you're referring to is the fact that S4's auxilliary ports are opened by backpressure. Which, if not working correctly, would actually cause a loss in high end power. Unless, which most people do, you remove the sleeves when you know you don't have enough backpressure to open (ex. straight through exhaust) then thus losing low end power.

 

.

 

where on their website is there ever a power gain listed?

 

you can get an Racing Beat Header that has the tube for your Aux ports...you can also just get the "other style" without and either use a RPM activated switch to Open and close your ports,Or just Wire them open.if you choose to wire them open you loose a bit of Power Down low.But it comes to life after 3800...I have a Header withTube.custom presilencer into a REVII Y pipe and two REVII Mufflers..For TII engine..But I have it all on my N/A.It sounds good,acts good,and the ports work.It Sounds rumbly but Good,and Not TOO loud.it Really starts to roar when you Punch it!

 

Actually, its just the road race header (for true duals) that has the aux port tube. On the regular single system, its on the presilencer.

 

For a stock NA car it goes manifold, downpipe, cat, catback. If you have individual primaries its called a header. Headers have downpipes too. They are the pipes that travel down from the collector to the cat/catback. Good example would be a shorty header on an SBC. It has a downpipe AND its a header. A midpipe is just a term that is used if you have an individual piece that can be disconnected from the mufflers, otherwise its all a catback exhaust.


BC

 

What is the link to get to the Headers i cant seem to find it.

 

I think the 1hp gain claim is silly. That's PEAK horse power.

There has, HAS to be an increase in the power/torque curves overall.

there just has to be....

 

When I installed my MindTrain header (Very similar to RB, slightly larger primaries) I didn't notice a change at lower RPM, but I did see an improvement up top! The nicest thing is that it gave me another 500RPM before the power falls off. Keep in mind that the stock manifold is designed to reduce noise through turbulent mixing of the rotary's rather sharp exhaust pulses, which also means a BIG flow restriction as you approach redline. The noise increased quite a bit and it got a LOT sharper. With a pair of stock TII mufflers it was just too sharp and not pleasant at all, but since I switched to the RB mufflers it's just very nice...