Wait for a used Dinan X-pipe, I've seen a few over the last year for $1500 give or take a couple hundred. You'll love the power gains, and with a tune would be even better.
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18