Upgrades to my stock 273 67 Dart GT

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I did this same swap and for the same reasons.
My well-tuned car would only pull to about 4700-4800 rpm's Wide Open with the 2Bbl and Single Exhaust.
I switched to Dual 2" Exhaust and a 500Cfm 4Bbl Carb. It maybe gained 5 Horsepower honestly. But!
It will pull all the way to the end of my tachometer now and gets about the same mileage.
I call it Smiles Per Hour and my seat-of-the-pants Dyno says It was well worth it!

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Redhelmet said:
I'm leaning towards doing headers at the same time so i don't have to go back and add them in later. So id like to hear opinions on TTI vs DOUGS and if theres any specific products from them that would be best/easiest to install! (LINKS would be appreciated).
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either will fit with your column shift, although you may need to alter the linkage slightly. tti offers a full length and a shorty-- i know you have to mod the linkage on the shorty, but it's not a big deal.

both sell a quality product, however you can call tti on the phone if you have a problem.

additionally, tti sells a complete exhaust system from the headers back.


Also I saw on the forums that dumping the exhaust before the bumper is cheaper and sometimes easier on the 67 darts (Correct me pls if im wrong) But what is your guys' opinion/advice on dumping the exhaust early as opposed to taking it all the way to the bumper, pros and cons of each?
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pros: it's cheaper
cons: it's loud, you may also get drone at specific speed/rpm

there are several companies that sell tail pipes (the part that goes from the muffler up and over the rear axle and to the bumper) specifically designed for 67~69 darts.

Redhelmet said:
Also curious if once i have headers and mufflers ready if my local shop can do the rest or do i need to buy/supply any more pipes etc
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a competent shop should be able to handle an install if you show with parts.

part of the benefit of a complete system such as TTI is that it comes with everything you need to do the install yourself. the connections are slip fit with clamps so you just bolt everything together and you're ready to party.

there are other companies that make complete kits (pypes, hooker blackheart) that are similar and can be installed at home, i know a few the fit is a little more fiddly than others but it's all doable.
 
i used a summit own brand header back dual exhaust kit on my 68 valiant. it included mufflers and came all the way out the back. it has slip fit joints and comes with clamps so nothing more to buy. the tail pipes need to be cut to length/preference under the bumper and in my case the middle pipes also needed shortening but that's just because valiant's are shorter wheelbase so won't apply to you. all in all a good kit that was easy to fit at home.
neil.
 
junkyardhero said:
either will fit with your column shift, although you may need to alter the linkage slightly. tti offers a full length and a shorty-- i know you have to mod the linkage on the shorty, but it's not a big deal.

both sell a quality product, however you can call tti on the phone if you have a problem.

additionally, tti sells a complete exhaust system from the headers back.

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pros: it's cheaper
cons: it's loud, you may also get drone at specific speed/rpm

there are several companies that sell tail pipes (the part that goes from the muffler up and over the rear axle and to the bumper) specifically designed for 67~69 darts.


a competent shop should be able to handle an install if you show with parts.

part of the benefit of a complete system such as TTI is that it comes with everything you need to do the install yourself. the connections are slip fit with clamps so you just bolt everything together and you're ready to party.

there are other companies that make complete kits (pypes, hooker blackheart) that are similar and can be installed at home, i know a few the fit is a little more fiddly than others but it's all doable.
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Thank you! I checked out the site for TTI and see 2.5 and 3 inch systems do they do 2 inch or 2 1/4 or would 2.5 be fine for my setup? Ill definitely give them a call!
 
mbaird said:
You could spend a bunch of money and time buying various parts OR you could just have your heads ported and get more HP. Just find a set of 308s and clean up the bowels / valve job / backcut the intake valves . .
If the engine is original it’s probably close to needing one anyway . And you would have a solid base to build from which will complement any future upgrade . Then that 4 barrel intake will make a difference.
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Actually, you want '302's...'308's have large open chambers...compression loss.
 
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