Where do you usually go to get mid-piping for car. 2.75 i wont lose power will i?

 

2.75 is excessive unless you have a turbo.

 

You're naturally aspirated, right?
And you want to run 2.75" ???
NOT a good choice in my experience...
Say goodbye to what little torque you have...:squint:

 

2.50?

 

What are your long-term goals for the drivetrain? What's your current setup?

Answer these questions and I can help you more.

 

coldair intake/ 4-1 headers / greddy exhaust / ls engine / i'm going to end up doing some type of forced induction very soon hopefully also port n polish and do some internals before forced induction in my friends new 3 car garage seperate from house

 

Then I'd seriously save your money for the FI setup. Don't bother.

 

x2

 

Well then i'm going to still get a high flow cat...does it matter what brand i get? ie... http://www.eracingzone.com/bomracacinrs.html

 

If you have an exhaust right now, don't worry about "getting it ready" for the turbo. Get the turbo first and then when you want to make more power upgrade the exhaust.