i want to run a true dual exhaust on my 95... where can i get headers?

since pre 95's dont require emissions in MA anymore id like to go straight pipes from the headers... any feedback on this?

 

you shouldnt need headers to run true dual exhaust. The stock manifolds are split for 2 outlets. But i would suggest buying headers being that every stock 300 I6 exhaust manifold i have seen has been cracked clear around it.

 

HeaderS? There would only be one. Have you even looked under the hood?

That being said, keep the cats and SMOG system in working order. Not only is it good for the envioronment but the truck will run better.

I would keep the system single. Duals are overrated and most of us will outgrow that stage. The 300 is a torquey motor, and single systems provide more torque than duals.

 

The question is have you looked under the hood??? the 300 I6 has 2 exhaust manifolds. Having built a few of these motors i should know. Clifford performance offers the split header design also. Know your s hit before you talk it.

 

Headers are not going to be a bolt-on since you'll need to add bungs for the HEGO sensor (which is easily done) and for the EGR system (which may not be as easy) and fab up a new EGR line. Clifford used to catalogue their block-hugger headers with all these fittings in place but the last time I looked they were no longer on the web site. Even if they were still catalogued there is no guarantee that they would ship them any time this century.

On a near-stock 300, there is very little to gain by replacing the stock EFI manifolds with headers, in fact a lot of older carbureted 300 owners have replaced their log exhaust manifolds with the EFI ones and reported significant gains. You could profitably put your money into other mods.

 

im mostly looking to make the truck louder and sound nice... not looking for the v8 sound but its so damn quiet.

will i lose power with straight pipes because of the loss of back pressure?

and do i really need to hook the HEGO and the ERG up since its pre-emmisions?... i know ill have to deal with a constant check engine light but sum black electrical tape can fix that lol

 

You could not get a V8 sound out of an I6 even if you wanted it. It is not physically possible. The V8 rumble is due to the fact that there are out of sequence exhaust pulses in each exhaust manifold. The I6 has no out of sequence pulses.

You will not lose performance due to a lack of back pressure. Without going into a detailed explanation, it is not loss of back pressure that causes the loss of low RPM power, it is the loss of exhaust velocity due to increasing the diameter of the pipes. Less pressure is always better, less velocity can be harmful. Losing cats and mufflers will poison the air that the rest of us have to breathe (and violate the Federal law in the process), it will annoy the hell out of your neighbors and probably garner you a few well-deserved citations from the police but it will not cost you performance. What do you have against the idea of keeping the thing smog-legal? It costs about 2 HP (vs. no cats at all) to but a single 3-way high flow cat on the truck and you gain part of that back by putting a high-flow cat back exhaust on it.

You cannot run EFI without the HEGO sensor. There is no option on this. The HEGO sensor provides the closed loop feedback which controls the fuel/air mixture and enables the EFI to work. When the HEGO sensor fails, the engine goes into limp-home mode where it consumes excessive fuel (literally 50% more in my one experience with a failed HEGO sensor) and has the ignition curve retarded to protect against detonation. In this mode it barely makes enough power to operate.

The EGR system costs absolutely no performance whatsoever because it is not active during WOT (wide open throttle). It only operates during warm cruise, at which time it reduces emissions and improves fuel economy. Why would you even think of removing it?

 

i didnt know it wood cause problems to remove it... i assumed without cats on the truck it would not work properly anyway

 

If you're determined to muck about with the EFI system, you really need to understand what you are doing and how it all works. Get a copy of:

Probst, Charles O., Ford Fuel injection and Electronic Engine Control 1988-1993, Cambridge, MA: Robert Bentley, Publishers, 1993. ISBN 0-8376-0301-3

There will be a quiz.

 

Clarification: stock is two manifolds. Some aftermarket headers will be one peice for the 300.

 

No muffler and a 300 is just annoying.

Adrianspeeder

 

To add to that, no muffler and any engine is annoying.

 

I'm running true duals on my '94 F-150 with a 4.9 5spd. I went with a dual inlet dual outlet 2.25" converter, to a dual inlet2.25" dual outlet 2.5" Magnaflow cross flow muffler. Then went for the dual tips out the passenger side after the tires with ss oval tips. looks amazing, sounds totally different and it passes emisssions with flying colors, went last week for my bi annual test. I built the system myself and left the manifolds and emissions systems factory. 200k plus miles and no cracked manifold yet!!

 

hows it sound... much louder?

 

it sounds nice....

not crazy loud, doens't have the deap rumble of the v8's I went wit ha big muffler because I didn't want it to loud. I leave for work at 530-6ish in the morning. here's a vid from when it was on the dyno, took it up to 4500 rpm's, sound quality is poor though.

http://s163.photobucket.com/albums/t...t=MOV03869.flv