I've been reading up on the Mufflex exhaust systems for our cars and I was wondering everyone's opinion on whether or not I should install one on my car. Currently i'm running a 3" 40-series Flowmaster single outlet dumped on the drivers side, 3" intermediate pipe, 1 3/4" SLP headers and 2 1/2" pipes to a Flowmaster Y. My motor has about 8.4 points of compression, heavily ported and polished L98 heads, ported Big Mouth Intake, Big Mouth Runners, ported plenum, 58mm TB, and a vortech blower pushing 12 psi of boost. I have a Lunati cam with LSA of 114 degrees, .465/.490 lift, 270/280 advertised duration, with 1.6 ratio rockers. I like the sound of Spintech and I was wondering if I have enough motor to use big 4" exhaust w/ 3" dual exits or if it would just be a waste of money. My car does sound unique due to the regular 40-series mounted in the stock location and dumped, but I really want to sound different and gain some horses if possible without going to duals. I feel I could lose some torque because my setup dynoed at approximately 550 ft/lbs and 445 hp at the rear wheels. It needs more tuning. I'm learning all the DIY computer stuff. I have yet to run it at the strip.

 

Just my opinion but if any car could use a 4 inch exhaust system it would be yours. I have not read good things about the Spintech or Flowmaster mufflers. I would option for either a Dynomax Ultra Flow or a Magnaflow or something along that line. Mufflex is a distributor for both.

 

What are the bad things you've read about Spintech? Flowcrapper bad things I can understand

 

Just what I have researched on the internet and dyno tests done my some. Some of these have gained ET and MPH by switching to a Magnaflow or Dynomax or another brand of straight through muffler. Allen

 

So you recommend I should look into other exhaust systems?

 

Hi Blown383.

If you are talking to me absolutely not. I would do some research(google) and just don't take my opinion as mine is just one of many and I have not purchased my Mufflex 3.5" system yet so I have no first hand knowledge. You can always talk to Mufflex as they are a distributor for Dynomax and Magnaflow and other mufflers as well and get there opinion. Allen

 

Spintech is a nice FlowmasterISH sound, but with less of the annoying raspy sounds. I like the soundclips that they have.


From muffler to muffler, the flowmaster flows horrible. The spintechs arent too great either, but it's not like you're going to lose 10hp out of the muffler... and if you're so concerned about THAT then put a cut-out right after the y-pipe and be happy with your 4" exhaust.

 

Heh, damn glad I saved this...

 

That's a great chart EvilCartman It's great, too bad it doesnt put an open exhaust w/o muffler, or a straight-through design (like Loudmouth) flow numbers to use as a baseline to know how much it actually holds it back....

 

Interesting mufflers Spintech chose to compare with. The Dynomax Turbo muffler is their old technology. They should have used something like the Dynomax Ultra Flow.

 

exactly what I was subtley trying to point out

 

I was mainly pointing out the Flowcrappers

 

And that applies to a 4" muffler how? I also do NOT see the Flowmaster 30 series muffler there... you know the one that comes with the Mufflex system. Lastly, mufflers need to do more than just flow cfm for pretty graphics. Look into it.

Save your propaganda for someone else, until you get real world experience. Too much BS thrown about by those who don't have a clue, which seems to be quite common around here.

Blown383 - The only downside to the system your looking at is weight. They're heavy! I've got a lot less motor than you do, and I lost no noticable low end torque. Power above 4000rpm definately increased. Do a search on the 4" Mufflex systems. I've posted in detail many times before of my results.

 

Blah blah blah blah you're spouting as much BS as the next guy. Why don't YOU come up with some real world graphs and charts. I'd be really interested in some dyno numbers and I'm sure a lot of other people would be too.

 

I'm kinda in the same boat. I am going to put my 406 in my other car and am going with single exhaust but don't know if I should go 3.5/4in or put a cutout on it and run mandrel bent 3 inch w/ a muff. My 406 ran 7.8's in the 1/8 with true duals 2.5 and turbo thrush muffs.

 

BS? I have first hand experience with the product in question, and you don't.

Charts and graphs may look pretty to you, but personally I like real world results. I may not have a flow chart (which is irrelevent for exhaust scavenging, not flow), or a pretty graph for guys like you to ooh and aah at. But when I can only keep up with another car from a roll, and hours later, I can inch past him, that's good enough for me. Especially when the G-Tech (a VERY useful tuning tool) verifies my butt dyno.

In the end, its my word vs yours. Experience vs conjecture.

Again, I ask you, what does that chart have to do with a 4" 30 series Flowmaster?

Edit: I run FASTER than you N/A, with old tech iron heads, a smaller cam, CCQJet, etc etc, and am doing it with a 4" exhaust. I must be doing something right...

 

Saw this chart on the Dynomax web site. Thought it might help those deciding on what size exhaust to use.

 

I'm not done with mine You happen to have a good working combo. My exhaust sucks for the new engine and haven't gotten around to putting on either a 4 inch single or some sort of dual and getting rid of the Edelcrock headers. I will be sticking with Spintechs cause I know they work from what I've seen with cars around town. There's other factors why my car is running the times it is, zero serious tuning, needs a converter change, couple other small problems that have now been taken care of and lots of other little things that add up big. Going to the track in a couple weeks to see if they make a difference. When first building this engine I thought it would be in the 11's N/A but it sure as hell didn't turn out that way.