Here's some facts from a sifu share with me last nite
STROKER KIT for 4G15 (RM 2000+-)
With proper tuning and modifications, able to produce 130bhp from this little 1.6 stroker kit upgrade, a very rough but durable engine.
4G92 (Sohc) RM3000+-
Stock condition is good and produce about 95bhp, with good torque and FC wise. After proper modification, able to output 160bhp after 2.0 stroker kit is installed.
BOT (Instant power) RM2000+-
This is the ultimate, BOT has no limit, so depending on how much u can afford, and the maximum cablity your engine can take, your boost has no limitation. But FC will be high.....Remember its RM2.70 now
G-Reddy Emanage Blue (RM900)
Forget about whatever engine first, this E-Manage, with proper 3D tuning through out the powerband range, a good tuner will do their best to balance out every RPM range, mapping the best balanced AirFuel Ratio, so your engine perform near to perfect condition, smooth, less stress.....That means more power, more FC saving and more accuraccy.
So, tk a calculator n figure out how u gonna spend for the mod, and the future maintenance factor.
IMHO, I'd get a 4G92 first, the stroke it to 2000cc, then get E-Manage, is a pretty good combination for a daily use car