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Old 04-20-2011, 08:16 AM
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No exhaust after the Downpipe

I tried doing a search first before posting but I didn't find any info, so forgive me for an repost. I have seen guys with no cat and muffler with good results. Has anybody tried to run no exhaust after the Downpipe? I have a 9 second 1988 Mustang with a 306 and T70 turbo with no exhaust after the Dowpipe with great results. I am not looking to drag my truck, just seeing what I could to do to get more power and better MPG. I have a 2006 F250 with 4" exhaust with no cat but has a muffler and an upgraded Downpipe, upgraded air filter, and a SCT tuner. I odered the truck with 3:73 gears with Factory 20" wheels, is this a bad thing? On my Mustang, more of a freeway gear and a taller tire worked great with my turbo setup on the drag strip, creating more of a load to get more out of the turbo, but hard on the tranny. I just did a 550 miles trip and just got 18.3 MPG, so if I remove the muffler or the whole exhaust after the Downpipe would this give me a better MPG and more power? And how would it be with towing?
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Old 04-20-2011, 08:25 AM
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dumping it right after the downpipe is not really going to give you any power gains on these trucks compared to running 4" the rest of the way back. In my truck, I want it quiet in the cab, and it is quiet in the cab with my MBRP 4" exhaust, and if I roll down the windows and stab it, it comes to life nicely. I had a dump before the rear axle in my 86 diesel F250 and it COVERED the under of the truck and all of the tailgate in black soot. Another thing to think about.

I have my 76mm turbo dumped just behind the front right tire in my mustang as well, and I love ithaha
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Old 04-20-2011, 09:14 AM
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What class are you going to run? You might be required to have a stack if draging in a class.
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Old 04-20-2011, 09:30 AM
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Quote:
Originally Posted by Racsirx View Post
I am not looking to drag my truck

Quote:
Originally Posted by Galaxie View Post
What class are you going to run? You might be required to have a stack if draging in a class.
Someone read wrong.
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Old 04-20-2011, 02:47 PM
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when i was looking into an exhaust and was reading through threads, most guys end up at the least, dumping it right before the rear tire and out the side. complaints of the smell getting in the cab and not being able to get it out. also, sooting up the underside of the truck. I've got a MBRP turbo back straight pipe, no muff and no kitty. And its plenty loud, not to mention sounds like a jet plane,but then has a mean growl to it when getting on it and when RPMs are above 2k-2250k. I've been toying with the idea of adding a diesel muffler/resonator to tame it some.
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Old 04-20-2011, 03:50 PM
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Quote:
Originally Posted by dhanna6powerstroke View Post


Someone read wrong.

AH HA! Yes, why do I sign in at work! lol
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