Well here it is....
The Famous test pipe hissing sound is completely gone. 2.5" exhaust didn't let out the carbon monoxide fast enough and generated the hissing sound. Going with 3" exhaust eliminated a lot of back pressure therefore completely eliminating the hissing sound.
Next month is the famous Fast Intentions Twin Turbo setup.
I've been work with my exhaust shop for over 5 years now. If you decide to jump on a project like this, definitely source the mufflers/flex pipes yourself. Flex pipes were purchased from Amazon, Mufflers were purchased from a local manufacturer. 3" exhaust is a very tight fit, find a good and reputable shop to do the work.
I'll post up a sound clip sometime this week.
