I have all TRD products on my tC. but i have seen some people mix in match between injen and greddy and so on. wonder if you could tell me if you get more performance out of other products then TRD.

 

TRD in general is pretty conservative with how "far" their mods will take a car. I too, have all TRD parts (with the exception of my short shifter and CAI), and I can honestly say the only piece of the whole shebang that I'm genuinely happy with is the suspension.

The exhaust, while unobtrusive and relatively quiet, is rather hideous from the rear (IMO) and doesn't provide much of a power gain from stock.