08 GSR build advice, input

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Jan 10, 2026 | 02:13 PM

onyx1121

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From: Arizona

08 GSR build advice, input

I'm the original owner of a 45K mile '08 GSR, OEM interior/exterior. Short history is cylinder two started to have minor compression issues while tuning on E85. Nothing catastrophic but definitely required rebuild so I removed the engine and transmission. Sounds like most shops are happy to rebuild the engine/trans to my specifications. My goal is to rebuild the car to a fast street car with long-term reliability. Boostin' is 30 min. away so my baseline plan is: Stage 2 block + transmission refreshed + diff pin fix.

Is an OS Giken TR2C Twin Plate better over the HDSS?
Given it's an '08, should I do transfer case 10mm bolt upgrade, CMC upgrade, ACD/AYC relocation
If I wanted to upgrade, what about XR FP Red, Kelford 214-B cams + springs + supporting bits (+ any upgrades to fuel, etc. below?)

Current modifications: Nisei UICP, HM shorten Intake, FP Red JB w/ PnP (new-in-box rebuilt by FP), Turbosmart Wastegate 22PSI, Tial QRJ sport 1.5PSI, ETS 4" intercooler, GM 3port, ID1300x Injectors, Walbro 450 Fuel Pump, Blaqops fuel pump kit, Zeitronix sensor, AMS 3” Turbo back exhaust, ACT ME3-HDSS Clutch, MAP Brake Master Cyclinder kit. Tuned for E85 with TephraMod v3.