I have a 2.9 sierra stockcar, the shell wasa xr4i, i has had the heads
ported gas flowed and skimmed, a 3 litre carb, it has huge exhaust
manifolds that finish just behind the block.(yes it is loud, very loud) Just wanted to know a few things

What sort of BHP do you think it will be running?
What is the most limiting factor power wise on thease engines?
Any good rolling roads in north england?

Also the stockcars is on a sunday morning, and my mum(yes im only 16)
insists she wants it to be quieter so she can stay asleep, what will adding exhausts do to the power?

Thanks Tom

Just to let you guys know, you will be shocked! the car i have bought was Third in the championship. In second was a COSSIE, yes being raced on the banger track, You have to guess what was winning.