The 06 and 07 GT's were the supercharged models and that was the end of it. FOr 2008 you only had the base models which the N/a 3800 with optional dual exhaust and the GXP only.
So to answer the question, 2008 was the last year for the non supercharged 3800 motors.
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Exterior- stock painted black wheels, clear corners, stainless steel grill, cross and drilled front and rear rotors with evolution brake pads.
Coming soon- 18 inch black mustang bullet rims, GT/GTP rear bumper, tinted windows.