Im looking to tickle my standard C20LET'd astra (mk3) and have been doing some window shopping. I was orignally looking at regals phase 2 - 280BHP, or phase 3+ - 300 BHP. But when looking at Courtenay i noticed for the same power levels courtenay recommends bigger turbo etc.. from the off where as regal doesnt.

To that end, can i expect things to go bang quite quickly with the regal phases? My engine is only 10000 miles in to a rebuild so it has pretty good internals athough not uprated.

I hope you can understand my ramblings and any advice is welcomed.