Shorty headers and flowmaster mufflers
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I've heard magnaflows flow better but honestly itd maybe increase a couple horsepower on the top end. Probably not gonna be worth the money, unless you just straight pipe it

 

Unless your putting out rediculous horsepower, exhaust really insnt going to matter. The money you would spend changing mufflers could be much better spent on other areas of the car.

 

I've seen a few magazine muffler comparisons that show the Flowmaster 2-chambers gave up a couple horsepower over other designs, but 1-2 horsepower is negligible at best. My motto; run what you like to hear IMHO....

 

couldn't agree more,run what your ears like,too many people look toward mufflers for more hp :facepalm:, flowmasters are cheap and sound good imo,i know those stainless cannon mufflers on hondas make like 500whp but not on mustangs sorry

 

As stated, the gains wouldn't be worth the cost of swapping, with your mods they'd be worth a 10th at best. They flow better than stock for sure but yes, there are better flowing mufflers.

 

Flowmaster super 10s i believe are not restrictive, i could see right through to the other side

 

yea i heard magnaflow flows better than flowmasters that's why i got me a magnaflow. but you won't hear a **** difference from stock to magnaflows. i say go with what you want to hear. magnaflows sound stockish to me

 

My next question would be: Would I gain more if I ran open headers at the track? I've had several ppl say I should disconnect the headers when I get to the track and just hang the H-pipe and mufflers up with wire or something. It's an interesting though but not sure if it's worth the trouble or not. I would have to gain at least 2 tenths for it to be worth it to me.

 

I hate to be the responsible adult here and all but that doesn't seem real safe (or well accepted by the track I am sure...).

Just my opinion. Do cut-outs if you want to go that route. But I don't think you're gonna see your 2/10th with it no matter how you slice it. Just my opinion.

 

Probably not worth it. Especially if you have an o/r h

 

I agree ^

If you want to run open headers then do cut outs

 

Pretty good read here.

I saw on a youtube video where a SBC actually made less power with open long tubes as opposed to the same longtubes and a 16 or 18 inch extension. Can't find the video to save my life though and of course every combo is different.

 

Spintech

 

The keyword in this discussion should be scavaging. All mufflers are restrictive, and any restriction will take power. What you're looking for is scavaging.