I know the greddy SP iz made for the GT but boltz onto GT an ST with np. But my question about this would be, is it realli advised to bolt it onto the ST? Because I hear that for pipin, 2.5 iz good for a GT while 2.25 iz good for a ST an since the pipin for the SP iz 2.5, does it take any type of compression away? Kinda dumb to ask but like I just wanna hear anotherz opinon regardless...im still deciding on what 2 get...

im almost 100% that the SP has only 2.25 piping... anyways, no it wont take anything away as far as compression. thats mapped by the ECU, all that it will do is induce the ECU to up the intake capacity to keep the normal compression (what is it, like 9:1 or something like that, i dunno). anyways that is a good thing. and it is also a reason air system mods should be done as a package.

--K2_Celica+Jun 2, 2003 - 10:41 PM

QUOTE (K2_Celica @ Jun 2, 2003 - 10:41 PM)

im almost 100% that the SP has only 2.25 piping... anyways, no it wont take anything away as far as compression. thats mapped by the ECU, all that it will do is induce the ECU to up the intake capacity to keep the normal compression (what is it, like 9:1 or something like that, i dunno). anyways that is a good thing. and it is also a reason air system mods should be done as a package.

im not exactly sure but i think you guys are talking about back pressure and not compression, compression has to do with the internals of the engine, not the size of the exhaust.

sorri..yah back pressure...

ya, i was just going off what he said, but ya you wont have any backpressure issues, like i said im just about positive that its only 2.25 piping anyways.

The sp piping is 2.25.

actually the greddy sp's piping is 60 mm which equals 2.3622 inches. >>

--gh0st_d0g+Jun 3, 2003 - 10:47 PM

QUOTE (gh0st_d0g @ Jun 3, 2003 - 10:47 PM)

actually the greddy sp's piping is 60 mm which equals 2.3622 inches. >>

thanks for the conversion for us lazy people pete >>

very nice~. I belive I'll make my decision now...