I had my loudmouth on first, then added the catted X later (about 4 months later). It will get louder and more high-pitched. It will go from a loud deep rumble, to sounding really pissed-off...almost exotic. It is really a neat sounding exhaust that will turn some heads. It sounds very agressive.
I would say that on a scale of 1 - 10 for volume:
Totally stock: 1
Loudmouth only: 4
Loudmouth+catted X: 7
Loudmouth+o/r x: 15
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Black 2000 GT Vert: Novi-2000 with Intercooler (375rwhp @ 9 psi); Tune by Kauffmans; Roush 380R Body kit; Steeda Subframes; Steeda Strut Tower Support; Deep Dish Bullets; FRPP 4:10's; SCT 4 Position Chip with four custom tunes; Steeda CAI; C&L Pleum; BBK 75 TB; SLP Loudmouth; SLP Catted X-Pipe; Bullitt Suspension; UPR Conrol Arms; Focus Fuel Pump
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