If you currently drive a 135i and theres nothing wrong with it.... why trade?! :]
Keep it! Especially since its an N54!
Mods: JB4 | Berk Race Axel-Back | VSRF DPs | BMS DCI | CM Meth + CMGS Controller | Stett CP | Tial BOV | RR Scoops | BMS LED AE | Matte Grills | 10% Tint | M Pedals | Blackline LCI | CSR Eyelids | Amber Overlays | Rear OEM Flaps | Seibon GTR Hood | Painted Spoiler | H-Style Front Lip | VMR V701s