Im currently thinking about building a high compression 5efte engine It will be running a td04 or maybe even a td05 if it comes to it. My question is, Do I build a high compression or low compression engine? Low compression will mean: more boost, therefore I will have to buy arp head bolts. less chance of det, so I can run standard petrol. Slower spool time so I would have to buy a hybrid/billet turbo. I will be running more boost so I will have to buy bigger injectors. High Compression will mean, I can get away with standard head bolts since i will only be running around 1.4/5 bar. I will have a quicker spooling engine so I could go for a td05 instead of a billet td04 etc I can run a standard toyota mls 0.5mm gasket so I will save money there aswell. I will have to run super instead of standard fuel. I can keep my current injectors that have just been rebuilt. What do you think or will a high compression engine wont perform as good as I think?