Questions about shorty headers - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 06-19-2014 Thread Starter
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Questions about shorty headers

I have Airaid CAI and Corsa axle backs on my intake and exhaust systems.

What is the bottle neck for my engine to breathe and exhale freely now? Is that the headers?

I heard some bad things about them. Some are saying that most aftermarket headers are not reliable. They would glow red if you drive the car for a long time, and could leak exhaust gas very soon.

What are your experiences on the shorty headers? Are they worth the hassle?


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2014 Mustang V6 3.7L 6-spd manual, with MGW shifter, Airaid CAI, BBK shorty headers, Corsa Sport axle back, strut tower brace, JLT oil separator, GT500 differential cover, BG Synchro Shift II gear oil, Redline differential oil.
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post #2 of 5 (permalink) Old 06-19-2014
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Cam & heads (ports). The oem systems flow very well and unless to get into cam/head mods or supercharging, there is little gain made with headers. Unless you go with shorty’s or actual custom built headers, 99% of all headers will require "massaging" to install (whether it's denting a tube, moving a bracket, etc.). Unless it is for racing purposes, in all reality, there are little differences in overall performance between shorties (Tri-Y), mid-length & long tube headers.....shorties actually perform excellent up to about 5500 rpm and then will have a slight drop until 6k rpm when it begins to really decline.....more than enough for street use and while some state that shorties don't work well with the new gen engines, BBK seems (and others) have different dyno results.

Hedmann in the 60's/70's an excellent product and considered one of the top mfg's with Hooker....they were built in Culver City, Ca until a few years ago. Beginning in the late 80's Hedmann quality began declining & today, they are considered an "inexpensive Header", meaning, you get what you pay for. IMHO I would place Patriot & Blackjack in the same category (although both seem to be offering a higher-quality header line also). In general, the head plate should be at least 3/8" (1/2" is best), tubing should be at least 16 gauge (14 is best).....otherwise leaks and burn-though are going to be a problem as well as the longetivity of the headers.


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post #3 of 5 (permalink) Old 06-19-2014
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The primary bottleneck in your 3.7L V6 engine's exhaust is the inner diameter of the resonators directly behind your catalytic converters. They are less than 2" inside, closer to 1.78". Cut them off and replace them with larger inner diameter resonators or with straight pipe if you elect to keep the cat's. Otherwise, remove the cats and resonators and replace with an open X or H pipe design.
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post #4 of 5 (permalink) Old 06-19-2014
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As for shorties, they produce a lot of low-mid RPM torque, which is what this engine needs most. 1/4 mile tests performed by the current NA 3.7L record holder yielded a 0.2 second difference between shorties and long tubes (long tubes producing slightly better top end). Remember, these are not V8's so their operating characteristics are a little different, as there is a large performance gap in V8 long tubes over V8 shorties. They're nearly identical in the 3.7L Ford world.

Don't worry about any glowing or rusting through. Aside from some occasional bad manufacturing practices here and there (welds and such), a majority of the shorties turn out fine. Go for ceramic coated if you can afford them, or chrome. Yes, the surface rust will eventually appear, but it will not eat all the way through. Stainless is a great way to go, but I don't know if BBK or anyone else is producing them yet.
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post #5 of 5 (permalink) Old 06-19-2014 Thread Starter
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Thank you all for the great comments. They are super helpful.


Quote:
Originally Posted by V6 Cannonballer View Post
As for shorties, they produce a lot of low-mid RPM torque, which is what this engine needs most. 1/4 mile tests performed by the current NA 3.7L record holder yielded a 0.2 second difference between shorties and long tubes (long tubes producing slightly better top end). Remember, these are not V8's so their operating characteristics are a little different, as there is a large performance gap in V8 long tubes over V8 shorties. They're nearly identical in the 3.7L Ford world.

Don't worry about any glowing or rusting through. Aside from some occasional bad manufacturing practices here and there (welds and such), a majority of the shorties turn out fine. Go for ceramic coated if you can afford them, or chrome. Yes, the surface rust will eventually appear, but it will not eat all the way through. Stainless is a great way to go, but I don't know if BBK or anyone else is producing them yet.

===
2014 Mustang V6 3.7L 6-spd manual, with MGW shifter, Airaid CAI, BBK shorty headers, Corsa Sport axle back, strut tower brace, JLT oil separator, GT500 differential cover, BG Synchro Shift II gear oil, Redline differential oil.
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