This is next on my list.

Anyone know exactly what kind of bolts and spacers are needed for convertibles? And given the cost if the kit, why the heck doesn't Ford just throw them in?

 

This is for those of you who have this system in place. Currently, I have the svt axle back in my car. I like it because it's not crazy like the slp loudmouths I had on my 2005 gt. But on the other hand, a little crazy would be nice. Can you really hear this when in the car.

I really like the sound of my car when someone, like the wife or mechanic at ford pulls away in it. But, inside it's too subdued. I don't want to wake the neighbors when leaving quietly in the morning. But, I want a little more baritone inside the car when I get on it.

Ultimately I can't decide on next mod, but some intel might help. THANKS IN ADVANCE.

 

IMO at an idle it's not much of a difference, it's a little bit louder and a bit deeper sound. Driving around in normal traffic it begins to shine, especially with the windows down, almost like you can "feel" the exhaust pulse. Take it above 2500 RPM and it becomes a beast. Loud and deep but not obnoxious or annoying. Not as loud as the SLP Loudmouths ( I had them on my '05 also) but more classy if you know what I mean. This is about the best I can describe it Eric, other than to say I'm very happy with it.

Can anyone else provide some insight?

 

 

More money I'm gonna have to spend...lol

 

It's worth it..... I had Roush axel backs on originally changed them out with FRPP sports. I have to do a video of those installed now while driving. Slightly different tone with the ford mufflers more refined. But if you do get the Boss quad system DO NOT INSTALL THE RESTRICTOR PLATES. The combination of a good axelback and the quad exhaust is amazing its such a refined deep rumble on acceleration and deceleration no popping or raspiness the wide open quad exhaust relieves the back pressure you can hear it on deceleration a very deep low grumble like on an old school Mustang. I personally think you have to do the quad with a good muffler to get the full effect.

I couldn't be happier with my results worth every penny. The sound is classic not obnoxious. There's a big difference there. Think of the chase scene in Bullit and the sounds those cars were making.

 

Hmm I like the gurgle/popping of the FRPP GT500 axle backs on downshifts, I don't want that to go away

 

I'm sure someone here has these with the GT 500 axle backs maybe they can chime in on this.

 

I thought I read somewhere that Ford pointed the outlets down so that most (a lot) of the sound bounces back into the cabin. This way, the driver can enjoy it without it being obnoxiously loud to everyone else.

This may also be my next mod, but like you, I'm a little bit afraid of it being too loud.

 

Having had this on my Boss 302 with restrictor plates out I can tell you its not too loud... ITS PERFECT!!! and its one my first mods for the 2013 GT

 

I went back and found it in the August 2011 issue of 5.0 Magazine. It's a photo caption on page 62.

"The sidepipe's rolled over or turned-down tip is there to aim sound energy down to the pavement, where it reflects back up to be heard by the car's occupants and not so much by the pass-by microphone used in certification tests. A straight tip designed for viewing from outside the car was tried, but proved to be too loud to certify."

 

+1 The tips are angled towards the ground and are just underneath the car in front of the rear tires, so you don't see them but you do hear them. Its a really nice sound not loud and obnoxious.

 

Can anyone share whether or not this exhaust is made from stainless steel?

 

I believe the tips are polished 304 SS with the bulk of the remainder being 409 SS.

Convertible owners...yes, FRPP should be including the requisite hardware to allow you to fit the system to your cars. I recently put together a system for a ragtop owner and as much as it was for a '11 GT500, the hardware that is needed to fasten the exhaust tip is the same. In order to clear the additional structural bracing affixed to the underside of the chassis on '11 and later S197 convertibles you'll need a M10 1.50 x 70mm bolt, 2 flat washers, and a 1 inch spacer for each side. This will space the tip down and allow 3/16" to 1/4" of clearance - just what you need.





The owner installed the system onto his well modified GT500 and he is very happy to say the least. His comments regarding the sound mirror much of what has been posted above. It really enhances the aural experience whether you had a stock or modified exhaust system to begin with. If any of you GT500 owners are interested in what it took, I started with the stock Boss 302 'H' section...



And after reconfiguring via cutting/TIG welding in some 409SS tubing I ended up with this...

IMAG0577.jpg?t=1336527837

The owner then took the pipe I reworked and used it as a template to show him where to cut his existing system so that he could clamp (using factory OEM clamps) the new section in...







Here it is loosely fit in before any of the clamps were tightened. Once torqued, the system pulls together tight, straight, and leak free...



A great mod. He runs his system without any attenuation plates and so do I.

 

Well I went ahead and did it. I order the quad exhaust last night. I tried to order the QTP QTEC302 kit, but the site is down for system upgrades. Hopefully the site will be up later this week so I can get those ordered and do the install next week when Im off from work.

 

Other than having some sound coming from under the side of the car..what benefit would I gain by adding these to my car?

 

I suspect it frees up a few ponies. The Boss guys claim that by removing the restrictor plates from their stock side exits, the dyno shows about 4hp gain...so adding the side exits to a system that previously didnt have them to begin with should certainly show some gains.

I detected a notiable seat of the pants improvement....but that very well could be plecebo because it sounds so kick-*** now.

It does wonders for the driving experience...raw, hardcore V8 roar with no echo-ey, resonating nonsense that a lot of exhaust systems introduce. Its the loudest "non-obnoxious" exhaust system out there, IMO. It makes rev matching easier (and more rewarding) too.

 

I can only imagine how this would sound on a 2013 GT 500! I love this friggin thread!

 

I'm anxiously waiting to have this installed on my car with electronic cutouts. Coupled with Steeda's cam idle tune i'm getting giddy just thinking about how it will sound.

 

^ This is what I plan on doing as well!!!! It's gonna sound amazing.

Has anyone heard how the SideBurners from Stainlees Works sound or compare to the Boss Setup?