Sorry but if everyone modded their car according to back for buck everyone would be stock.

Most mods out there cost a shitload and hardly supply any performance. Even a full blown turbo setup, with all the custom shit you'll be going through and tuning back and forth it's not really bang for buck either.

and a 5-10hp gain over a 2.5" system which gains another 5 - 10hp over a stock system = a 10 - 20hp gain 10 - 20hp is still pretty lame, but thats the NA world, not like your going to be making that power anywhere else.

And back for buck?
http://www.s2ki.com/forums/index.php...#entry14835746

Greddy TI-C single $500 USD, 70mm Cat back single exhaust with resonator and made by a Good brand. I'd say bag for buck if it wasn't for the exchange rate + Shipping.

And the Greddy TI-C 70MM single is designed and made by Greddy USA

Yea agree on getting a cai, or a header or a exhaust wont give you gains. But put all 3 together and it will. Tune em up and it will give you an even better gain, worth the money or not? It's really upto you to decide, thats why you have people who do ebay brands and some do high end jdm stuff.