Full exhaust or open headers?

[Bones Jackson]

I haven't personally compared the two. Do open headers produce that much more HP and TQ?

 

[Budnicks]

yes they can

I haven't personally compared the two. Do open headers produce that much more HP and TQ?

Yes if the engine is tuned properly for open headers, jetting, ignition timing & you have the proper header tubing size, type, length, style of collectors &/or extensions.... It's also lighter with out the exhaust system...

 

[lewtot184]

actually you can come pretty close to open header performance with mandrel bent pipes and straight thru mufflers. the system will be noisey though. a lot may depend on cam timing. a long duration long overlap cam is going to favor the system with the least to no back pressure. lot of variables.

 

[383man]

As said if you have a real good exh system you might be close to open header performance. I use 3" mandrel bent exh on my 63 all the way out to the rear bumper. I race it thru my exh as I have never uncapped my 63. Ron

 

[Moparmatt72]

for a .060 over 440, 10:1 comp, ported stealth, M1 ported intake, hooker super comps 2" prim., either a 850dp or a dom, 727 and a dana with 410s I was thinking of running a 3.5 system but dumping in front of the rear kinda angled out, would that affect hp all that much or just keep to 3". Sry if I thread jacked I was just wondering, the car is mostly drag and will run a H pipe

 

[shag766]

i went complete tti 3" from the headers to the bumper but also put in electric cut-outs. does it make more power i don't know but it give's you a feel good feeling. like stated above its in the tuning.:headbang:

 

[lewtot184]

for a .060 over 440, 10:1 comp, ported stealth, M1 ported intake, hooker super comps 2" prim., either a 850dp or a dom, 727 and a dana with 410s I was thinking of running a 3.5 system but dumping in front of the rear kinda angled out, would that affect hp all that much or just keep to 3". Sry if I thread jacked I was just wondering, the car is mostly drag and will run a H pipe

3" with ultra flow mufflers is plenty good enough.

 

[Moparmatt72]

3" with ultra flow mufflers is plenty good enough.

I have the new super 44 3" mufflers now and aren't they supposed to be comperable to the ultra flows as far as flowing characteristics

 

[67 coronet]

for a full time race car,open is better with correct tune.for a steet strip car and todays hiflow technology in mufflers,run a full system.i always run a paint stripe down the outlet of open hedders,make a couple of passes,then cut it off where the paint is burnt off toward the end.cheep way to"tune"a hedder.

 

[Bones Jackson]

Reason I'm asking is I'm shopping for an exhaust now. I race on the weekend and hit a cruise occasionally. I was unsure how the cut outs would work too because my TTI header collectors kind of angle towards the driveshaft.

 

[383man]

I bought the TTI 3" X-pipe system and not the Max Wedge system as I have no cutouts on my car. I use the Dyno-Max Ultra-Flow mufflers also and you can see where my tailpipes end here. I did that because they say the X-pipe gives a tad more hp and I did not want cutouts as this old man is to lazy to crawl under my car at the track to uncap the cutouts. I really think this system works good and would be surprised if I was any more then a tenth faster uncapped if that. I really like this setup as it sounds good and seems to flow good. Ron

 

[383man]

Not a good pic but if you look hard you can see my X-pipe. Ron

 

[lewtot184]

Not a good pic but if you look hard you can see my X-pipe. Ron

there actually was a test in a mopar mag a few years back with what you are running and open exhaust. i think there was only about a .1 of a second difference. i use the 2" tti headers, 3" h-pipe and dyno max 3" mufflers. perfect fit, a little noisey but not bad.

 

[womanator]

My 67 Dart.
446
tti's headers
Runs 10.71 threw the exhaust and off the juice

The exhaust

The headers

 

[womanator]

That being said.
My race car did gain a .10 of a second taking off the exhaust

 

[Bones Jackson]

Wow only a .10 second? Once my Fords axle is fixed I'll order a full exhaust or see what someone wants to bend one up.

 

[HEMI-ITIS]

I might have a little more HP than the average.I use a 4 inch pipe off a 4 inch collector into a 4 inch "X" pipe reduced to 3.5 at the Hooker Aerochamber mufflers back to 4.5 and tailpipes out the back bumper.Even if I picked up a tenth or 2,it would be from the weight loss.It's alot of work to remove.I'm more street than strip,so I just leave 'em on.You can't hear my car in the burnout box next anything with open headers:blob1:

 

[womanator]

You The Artist.

 

[robinsonwr]

I agree a good mandrel bent exhaust can make as much hp as open exhaust. I have seen where the added backpressure actually will make a little more than an open exhaust. Example would be to large of a primary tube or collector size for your combination. I prefer exhaust over open headers because the look you get when you dust their a** in a pseudo street car. Even better with exhaust and DOT tires really pisses'em off, just saying. The days of restricted exhaust and losing 20-30 hp just by bolting on muffs are over

 

[Bones Jackson]

I've been calling around to muffler shops and no one can bend up a 3 inch. I guess these shops dont have the equipment needed.