I think the stock may only be 8.8. But I have stretched 8.8's as a longer bolt to install a UDP.15.9 @ 86.7mphInjen CAI, 55mm TB, P&P Intake, Crower Cams, Hooker Header, ERT/Catco Cat, GS-T Muffler, AFX UDP, Crane Ign Amp, S-AFC