there is no TURBO as such in those kits, it only got a timing advance processor, which "electronically" advances the timing, and is required in latest efi cars. Up to 2000 model (civic at least) the timing can be advanced manually on CNG so there is not need of advance processor. However, if you Do install it, you will get good performance on both petrol and gas, as on petrol car will run on original timing. tc