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.

rotarygod

iTrader: (1)

Absolutely not true about headers not making much of a difference. Headers work better on ANY engine porting style. Here are the biggest gains you can get from your street engine in terms of noticable improvement in power/acceleration. Headers, lightweight flywheel, standlone ecu, porting. Porting being last! Intakes, manifold port runner matching, igniton systems etc come way down the list but the header should be the very first thing to get done. Even the Pacesetter header will out do a downpipe by a long shot. Way back when, I had the Rotary Performance downpipe and a Brullen catback system. I swapped out the downpipe for a cheap Pacesetter header and it wasn't even funny how much power picked up, especially on the low to midrange. Much more driveable, fun, and fast car. Huge difference. It's not about total airflow. Total airflow doesn't always tell you everything since air is funny stuff. It's about tuning.

mali_FC

I don't plan on porting my engine any time soon. Mater of fact the engine runs great now, as is....knock on wood...hehee.
I was just confused between the two.....
And I'm not a fan of the noise, especially when driving on the freeway.

dsmrx7

Header...cause it looks cooler...LOL

suburban6lts

learn to weld, i used 2.5" exhaust pipe, welded the flange cut from the first cat and the rear cat, used one 45 degree bend and welded it together. i did the air pump mod for the secondaries and ditched to stock mufflers for two front mufflers from a volvo 240 (75-93 240 volvlos have a front muffler that is 2.5" in and out, fit perfectly behind the bumper and only cost about 25 bucks a piece.(no back pressure at all!!, i tested it). You can use some crome tips or keep it under the bumper for stealth(like me). my motor is ported with a custom cold air intake, scoop on hood and cold air box. For a stock feul injection with a air flow meter, the car is a f**king rocket. WAY more power over stock. Remember hot air flows better than cold, so dont think it is better to run 4" exhaust like some people claim, it will acually make more back pressure than a smaller pipe. Turbos would be the only engines to benifit from this.

Jager

iTrader: (10)

Is this on an NA, since you need back pressure to actuate the 5th/6th ports. Or was that fixed by the 'air pump mod' (I'm not familiar with it).

Not trying to be a jerk, just hope to be enlightned.