Hey guys, 03 coupe with out the sport package... I had 225/50/17 front and 235/50/17 on back.. but my cars alignment messed up the front two so I got two used tires from the junkyard..

Right now I have 245/45/17 on the front and 235/50/17 on the back... Is that bad? Should I put 245/45/17 on the backs too? Or should I put it off till I have more cash.. Also what psi should I fill the tires to? The sticker says 30 but the front doesn't look properly inflated at 30

 

The G is really sensitive to the tires being correct diameters front/rear. If done incorrectly, the VDC can trip and cause issues. Lots of threads on this posted. You can run the 245's up front, but using that with a 235 out back isn't a great idea for many reasons. The 245 should be matched with a 255/45-17 or 285 out back for best results (assuming you have the correct width wheels to make that work). I would try and get the proper combination have that be correct rear size or move back into oe sizes.

 

BTW, if you have a "Sport package", It should have 19" wheels, someone pulled a switch.