Mustang Bullitt Forum banner
1 - 11 of 11 Posts

·
Registered
Joined
·
176 Posts
Discussion Starter · #1 ·
I'm up in the air on this one. I've heard that Headers are a decent mod, but I have also heard that the factory Headers that we have on our Bullitts are not that bad.

Are the long tubes that much better than shorty headers? If you are blown is there a big net hp return over n/a?

Your two cents worth is appreciated.

Mike
 

·
Banned
Joined
·
7,235 Posts
Hmmm,good question. I have seen anywhere from 12-25 RWHP,depending on whose dyno you use. The factory log type manifolds are really crude,with no branch length or seperation at all,just a means to connect the head to the exhaust pipe. However, it may not be that big a deal with the small size of the 4.6 engine. The larger the displacement,the more important the exhaust. Normaly long tube headers give better torque gains than shorty types. I think the best header for the 4.6 2V engine would be a 1 1/2 primary tube dia. Tri-Y type header,which would have to be cu$tom built. These are great for building torque in the 2000-4000 RPM range. Putting any kind of header on the Bullitt is going to be a hassle. If I were to do it,they would be of stainless steel tube,for a one time installation!
 

·
Registered
Joined
·
2,060 Posts
Got 13 rwhp with JBA Cat4ward shorties. Got 14 more with a MAC Prochamber off-road H pipe. So basically, I have $1100 worth of exhaust mods for 27 rwhp. That's about $40 per rwhp!
 

·
Registered
Joined
·
176 Posts
Discussion Starter · #4 ·
Thanks Mus408 and Wade, I've learned a lot from bullittheads like you. So, headers can be complex, expensive, and produce just "so-so" results on our Modulars. Looks like they performed better on the 5.0s and maybe earlier modulars. Huh.

I'm leaning towards not going the headers route even though the gains might be better with a SC. Basically, I'm finishing up with gears and maybe some mufflers.

Wade, I added up the cost of my performance Mods (SC, smaller drive pulley, X-Pipe, and Alum. D/S) and the cost was about 5K for 140 rw/hp. That is $35.70 per hp. IMHO, your exhaust mods were not that bad when you consider that you have a lot more of your warranty left than me and will worry less about your pistons, since you are NA.

There are trade-offs with everything.

Mike
 

·
Registered
Joined
·
393 Posts
it's probably a good idea to consider where exactly the gains are occuring. Long tubes should help across a large part of the powerband. Sometimes you can't just analyze a peak power/tourque gain; would you rather gain 8 rwhp over a span of 4000rpms or 15 rwhp over a span of 1500rpms??
 

·
Registered
Joined
·
762 Posts
Off topic, but hey there JB I saw your new ride. Looks fantastic!!!
 

·
Premium Member
Joined
·
5,360 Posts
where's a pic JB?
 

·
Registered
Joined
·
2,681 Posts
Yeah i think i am going to get the exhaust then the headers and cherry bomb mufflers Loude is good. :lol: then it is time to work on the porting
 

·
Registered
Joined
·
176 Posts
Discussion Starter · #10 ·
JB, thanks. Looks like in my case, shorty headers would have some gain but not enough to justify the expense.

BullittBro, you really for for it! Good luck with your deployment. I did it a lot in the USAF/OSI, keep us safe.

_________________
Mike Rudy, DHG Bullitt, No. 04009,
Vortech S Trim SQ w/3.12 Drive Pulley, Bassani X pipe w/cats, FRPP Alum. D/S, Steeda Tri-Ax, AutoMeter Boost Gauge on A Pod, MGW Billet Interior. Next: FRPP 3.73 Gears

<font size=-1>[ This Message was edited by: mrudy on 2002-01-30 17:33 ]</font>
 
1 - 11 of 11 Posts
Top