I have the full Kooks 3in exhaust with Kooks headers.
That mofo drones pretty bad at somewhere around 2k rpm's at 68-70mph in 6th gear.
I bought two Kooks R300-14 3in bullet race mufflers to weld in the back half of the X Pipe.
https://www.summitracing.com/parts/k...0-14/overview/
The Caddy CTS-V guys do it that way and it works for them. Hope it works for me too!
Just look at posts like this over there: https://www.ctsvowners.com/forum/6-e...-mufflers.html
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2010 2SS RS A6 781rwhp on E85
Stage 2 ProCharger D1X
Circle D 3400 Triple Disc
Kooks Jet Hot Headers
Kooks Full 3in exhaust
Trick Flow GenX 255's
Polished PAC .660's & Ti-retainers
TSP VVT 3.2 cam kit w/DoD Delete
Smith Bro's Trunnion kit
AEM X-Series OBDII Widebands
FIC ID1300x Injectors
GM ZL1 High Output Fuel Pump
DSX Tuning Flex Sensor
DSX Auxiliary Fuel System
Tim King Stage 4 Max Effort CTSV 6L90
DSS 1 piece aluminum driveshaft
JRE 6L80E / 6L90E Dipstick
NGK Iridium IX spark plugs #7 heat range
Mighty Mouse Camaro 5 Wild w/-12an and Billet Black
HP Tuners VCM Suite
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