That's good to know. However because it's so cold, my car is SO LOUD in the morning. The flows will make it worse. It won't take long for my condo association to start complaining about me waking people up at 6:30 when I leave for work by starting my car and setting off every car alarm in the lot.

 

This is very true, I tested a few combos actually.

Stock Manifolds, Cats and H-Pipe, SLP Loudmouths - Pretty loud and resonates well and sounds aggressive.

Hooker Long Tube Headers, no Cats and Stock H-Pipe, SLP Loudmouths - Very very loud with far too much resonation, sounds like "High Velocity Trumpeting Popcorn".

Hooker Long Tube Headers, no Cats, Stock H-Pipe and Stock Mufflers - Sounded sooo bad I thought I had a really bad case of "Exhaust Leaks".

Hooker Long Tube Headers, no Cats, Stock H-Pipe and Straight Pipes with "Turn Downs" - Sounds like my original SLP Loudmouth setup but much much louder ( think.... race car ), sets off car alarms and very similar in sound to the 03+ Cobras. I scared somebody outside my work again today when I left for my break. She jumped 5 feet, she thought I was "burning out" or so I heard.

-Dan

 

Dan... I've been following your "tests" and I have a question. I plan on LTs and I'd like to keep the SLP LMs. Any thoughts on how it might sound with a catted H-pipe between the two?

 

Ditto

 

Dan, I have a question myself. Right now I have the Bassani axleback and Bassani off-road x-pipe. It sounds AWESOME under 2500 rpm... but as soon as I give it a lot of gas, it sounds like a trumpet. I know it's because of the lack of cats that I am getting that resonating tone. But you have no cats, and don't get that tone... any ideas of why, and what I can do to my exhaust to fix it. I'd rather not put on the cats if I can avoidd it. Plus, I bought the off-road x-pipe so would have to spend another $150 to get the cat legs from Bassani.

 

The "Turn Downs" at the end of my system helped with the Trumpeting annoyance. You basically need to introduce so more restriction to decrease that resonation.

A catted H-Pipe would work fine, perhaps even the Hi-Flow kind if you wanted to keep those Loudmouths Don.

Just think of it all like this, if I can get away with not running a single restriction other than turn downs @ the ends and it not sound like dung IMO, you guys have an example to work from and a lot of working room.

-Dan

 

I do love that sound, here is a short video of my 1970 Mach
http://video.freevideoblog.com/player.aspx...9F-F52F278E6837

 

IM GOING WITH THE FORD RACING SHORTY HEADERS, BASSINI X-PIPE WITH COMP CATS AND FLOWMASTER AMERICAN THUNDER SETUP. THEY ARE ALL ON MY CHRISTMAS LIST AND WILL BE INSTALLING IN SPRING.....IF I CAN WAIT THAT LONG LOL

 

Is this your caps lock key?

 

 

Thanks for the advice, Dan. I'm just going to have to save up for the Bassani hi-flow cat legs for my x-pipe. Until then, I just wont floor it so I don't have to hear the trumpets back there. Hard to do, I'm sure... but I'll save a ton in gas. Ironically, I may be able to save up enough in gas over the next month or two to buy the cats.

 

I like the JBA's. Nice and quite on the highway, but sound good outside the car, really deep, not too loud.

 

It will be between the SLP's or the flowmasters. Still can't decide. I just have heard such great stuff of both! My question now is, what's the difference between the Flowmaster American Thunder axle-backs made for the 05 mustang or just getting 2 Flowmaster Super 40 muffler's and swapping them for the stock ones? I mean couldn't I in theory just get 2 40's and dump them in instead? But in turn, there has to be some sound/performance or other reason why they designed a system just for the 05 tho?

 

This article makes mention of the difference between the Mustang exhaust and the 40's.....

http://www.fordmuscle.com/archives/2005/03...flers/index.php

"We went through six design changes on our '05 muffler before we were ready for anyone to hear it." commented Kevin McClelland, head of R&D at Flowmaster.