Is the silicone coupling 3.5 or 3.25 for the tb.

 

3.5.

 

to work with most intakes you will need a 3.5 to 3 reducer

 

Unless you have a stock intake and then youll need a 3.5 to 2.5 which can be found on E-bay.. At least thats what it is for Redlines :P

 

thanks for the help

 

using the LS4 with anything but a 3 inch intake is a waste

 

Not really.. I'll see better gains on my Stock intake on an ls4 than i will with an Aftermarket intake IMO.. The Intake for the Redlines outflow any performance intake on the market and those are few and far between. our intake compared to yours, yours does bends while ours just goes straight down.