Jeep Srt 8 Magnaflow X Pipe. If you're happy with the sound in the videos you've seen, then just get the Magnaflow X (assuming you need the X, not Y) or knock-off equivalent. Their gentler radius allows for better exhaust gas.

MAGNAFLOW 2006-2010 JEEP SRT8 GRAND CHEROKEE GC 6.1L HEMI ...
MAGNAFLOW 2006-2010 JEEP SRT8 GRAND CHEROKEE GC 6.1L HEMI ... (Stephen Aguilar)
Made in the USA and engineered to last, for those seeking increased performance and better economy, MagnaFlow MF Series Performance Exhaust systems deliver the smooth deep sound you want and the wide-open performance power you need. Kooks has been the leader in performance headers for some time. I want to get a better sound without losing performance.

I left to factory resonators in the back alone.

I wish Bwoody would have came out with these a long time ago, definitely worth every penny, the guys at Bwoody definitely hit this one.

Magnaflow Jeep Srt-8 X-Pipe, 2006-10 Jeep SRT8 | BWP ...

JEEP GRAND CHEROKEE SRT-8 6.4LT HEMI TWIN 3" MAGNAFLOW ...

2014 Jeep Grand Cherokee SRT Magnaflow exhaust start up ...

Jeep SRT8 Exhaust WK1 Magnaflow Catback (reso delete ...

JEEP GRAND CHEROKEE SRT-8 6.4LT HEMI TWIN 3" MAGNAFLOW ...

2008 Jeep SRT8 Magnaflow mids and SLP Idle - YouTube

Jeep Cherokee SRT8 | Corsa Performance Exhaust | Real Auto ...

Magnaflow 3" Mid-Pipe w/ Cat for Charger/Challenger/Magnum ...

Mufflex (straight pipe rear) + suitcase replace ...

2006-2010 Jeep Grand Cherokee SRT8 6.1L V8 Kooks Exhaust ...

MAGNAFLOW Catback Dual Exhaust 12-20 Jeep Grand Cherokee 6 ...

Magnaflow DF Catalytic Converter 05-06 fits Jeep Grand ...

MAGNAFLOW Performance Y-pipe for 12-18 JK Jeep Wrangler 3 ...

JEEP GRAND CHEROKEE SRT8 6.4L 12-15 Magnaflow Performance ...

Magnaflow High Flow Cats X-Pipe | 06-10 Jeep Grand ...

Magnaflow Direct-Fit Catalytic Converter 06-09 Jeep Grand ...

06-07 Grand Cherokee SRT8 6.1L Eng Y Pipe With Dual ...

Magnaflow 16709 Cat-Back Exhaust System for 2006-2010 Jeep ...

Not enough back-pressure, and you'll feel the slower take-off. What can/should I replace the back. It's just the right amount of back-pressure.