I believe they make the mufflers for FRPP....I have the round ones. They, according to FRPP, are louder than the oval stock style-looking mufflers. The round ones are supposedly only 49 state legal, where as the oval ones are 50 state legal in terms of noise. They give my car a deep, almost big-block sound.....they do have drone when driving around town, but I just did a trip from Atlanta to Orlando and back and it seems that with the cruise set, the drone is minimal if any (cruise set at 78 to 85 mph)
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2006 Mustang GT, Vista Blue, spoiler delete, premium package, Borla mufflers, C&L CAI, SCT tuner by Brenspeed, Hurst Comp Plus shifter, Steeda UDP, 4.10 gears, J&M lower control arms, Steeda adj. UCA, Raptor Perf. shift light, aluminum driveshaft....
I've got the oval Borlas...they are legal in 50 states (or 51..i don't remember)...I think they make a really sublte difference. I'm happy. They do not drone, they seemed to improve the car's perfprmance...and definitely sound a bit deeper. I would say they are the perfect upgrade for someone who wants a street car.
I have Borla Stingers (round) they sound awesome and did have drone, but after installing mac 1 3/4" headers and prochamber it decreased significantly. much better now, but overall is louder with headers, just not as much drone.
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06 GT / JLT CAI / BBK twin 62 TB /crower II/ 4000 stall / 4.10s / udp's / Borla axle back / MAC headers ,Prochamber/spydershaft/ 15 x 10 Bogarts w 325/50/15 on back and 15 x 3.5 on front. 10.90 with 1.48 60'w 150 shot zex.
Two different Borla Axle-backs?
