On the 07+, get the HFC's. The CEL fix available for the 07+ are hit or miss at best.

Our 03-06 HFC's are 2.375", our 07+ are now 2.5".

 

why don't you look into megan test pipes...BUT look into the V2 with the o2 bung and flex joints...i have these and have no issue with the CEL code or have to worry about them cracking with flex joints built in...PLUS there are many others who have been running these TPs for over 10k miles with no problems either...

my suggestion like others have said, it's good to ask questions but just read around the forum to get more of an understanding of what you are looking for...everybody has a different perception of what part is best or sounds the best but ultimately it's your car so you need to make that decision for yourself...

but as for flow, you NEED to get a 2.25 diameter exit on the TPs so the flow is not disturbed, you are leading to problems down the road if you run different diameters and IT WILL sound crappy...

as for the V2 i'm not sure if they make it for the 06+ yet, but i'm pretty sure if they haven't made it yet, they are really close..here's a pic

 

^^

Yes the Megan test pipes will fit 03-06, but not the 07+ year models.

BTW, I wonder why more companies don't utilize the flex joints in their test pipes. I think that's a great idea.

 

i have no idea why other companies haven't used flex joints yet, they make a world of a difference...and as for not having them for the 07+ i'm sure they will be coming up with one soon, they seem to be heading in the right direction these days