welcome mate! 4 inch might be getting a bit carried away on a stock motor. a friend of mie has a full 4 inch on his stock skyline and it drones and has completely sucked the life out of his bottom end.. only suitable in high boost applications or your car WILL go slower.. "exhaust backpressure" is something you should look into.. as for the rims, i think they would go great with some nice mudflaps and hella supertones! yewwww!

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06 sti