exhaust and intake questions, celica gt Options

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How much hp will the greddy sp2 exhaust system and the injen sri add to my 98 celica gt 5sfe. Just trying to see if it would be worth doing......

And is the greddy sp2 a direct bolt on ??????

Thanks

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i want it to throw me back a little..... but i dont think 15 hp more is gonna do that... or am i wrong???

Realisticly, either engine swap/ turbo, or just buy a different car if you're wanting to get thrown back in the seat.

yeah man.... im stickin with the celica, ive always liked celicas and this is my 2nd..... also theres so much history behind them in the wrc.....theres no way i would buy another car ..... but i might do an engine swap a few years down the road when this engine goes out.... even though this car is a little slow i still love it and am keeping great care of it so it lasts..... shes only got 109000 miles so it has a lot of life left in it...... i guess im just gonna have to bear with it for awhile and wait untill summer to see what ill actually do to it.... as of now that i finally realize that theres basically no way of getting it faster at the moment for 2500 bucks or below...... i minus well get it to look cool and "fast" as a 7th gen commercial states lol.... prolly gt4 front end conversion, 17s, and lower it a little, and in my opinion i think ive got a better lookin car than my old 7th gen celi..... but i guess in reality im gonna have to bear with the slowness untill i swap it and the big problem money. because i think a total engine swap is around 5700 bucks to do it right