The Disclaimer States, “ ...be aware that this off-road exhaust kit may exceed the sound level ordinances in many communities...”
Well, it’s loud... and it’s deep... and it’s mean, but I’m not too concerned about violating any local ordinances. I can say with certainly that this is the best overall sounding exhaust system (axle or cat-back) available for the S197 model. I’ve contemplated purchasing this kit since January. I could have saved a lot of time, money, and aggravation if I had acted sooner.
I’ve personally own, installed, and experienced the following exhausts on the S197:
2007 Mustang GT-
Flowmasters #17410 (X2)
SLP Loundmouth #M31014
FRPP/Borla Stingers #M-5230-5GT
Mac Boom Tubes #BT2005
All of the aforementioned exhausts sounded good, but in comparisons the Roush set-up wins hands down in acoustics and quality.
Based on my experience, and due to the design of the exhaust system on the S197 (mufflers located past the axle), the louder the exhaust- the greater the drone/resonation. It’s a sacrifice that I wasn’t willing to compromise.
The Roush system is unique in that the resonators (pseudo mufflers) are located before the axle, thus providing volume while minimizing resonation. This set-up is significantly louder than OEM, yet the drone level is equivalent...
I’ve heard the Corsas and the KRs. I agree with the masses, the Corsas definitely do not drone, however, many say that the KRs don’t either, but I digress. While the KR s have negligible drone, I’d say it compares to the level of the Roush system, however, the Roush exhaust has twice the volume.
Installation: Unless you have access to “lift”, installation will be a PIA. Removing the OEM mid-pipes was easy. While on floor ramps I lifted the body to create more space to maneuver between the body and the axle. Conversely, installing the Roush mid-pipes was difficult. The Roush system seems to be made of thicker grade steel and the mandrel-bends play havoc in getting them positioned over the axle. I actually had to temporarily removal the springs on the passenger side (remove the sway bar, shocks, and drop the axle) to facilitate installation. There may be other techniques, but this method worked best in my application.
Conclusion: The Roush system is not a loud obnoxious exhaust. It generates a “tuned” high volume aggressive tone with minimal drone. While no axle/cat-back system yields measurable performance gains, this system feels like the car gained a few hp/tq. It definitely sounds faster! My pursuit to find the perfect sounding exhaust has ended.
Edited by SteelTownStang, 30 September 2011 - 08:03 AM.