Thread:Gunner5795gt/@comment-3019062-20130129082154/@comment-4850381-20130130074753

There's a way to make your car faster with out touching the engine area. You can spend alot of carbon fiber parts for your chasis which makes your car lighter or a cheaper solution which I don't like is stripping which removes luxuries of your car such as air conditioning, second row seats, spare tire and etc.

Since you say that the modification restriction doesn't apply to you, you can still make your car faster with out  force introduction (turbo and supercharger). You can bore your engine with out adding more cyclinders by just increasing the size of the pistons and the engine body (EX: changing a 2 liter 4 cylinder engine to a 2.4 liter 4 cyclinder engine), but its really cost and alot of work. You can forge enigine parts such as pistons and etc. You can also change your fuel injectors for lager ones so they would spray more gas into the engine to mix with air for more power but even though it isn't as expensive a boring your engine, it's still expensive.

You  can also do engine swaps while still keeping a NA 4 cyclinder engine. Your mate's Gt86 boxer engine redline is 7000 while making 149kw. 7000 redline is consider high for most vechiles.Honda's S2000 engine is pretty good. It's redline is 9000 while it's still a 2 liter 4 cyclinder engine. Mazda rx8's engine is a NA having a redline of around the high 8000s while it's a 1.3 liter engine making around 238hp= 177kw very close to s2000's power. It's a Wankel engine design and it doesn't use cyclinders at all yet it's small comparing to piston engines.

If you don't want to do engine swaps then you could just modify the DOHC (Dual Over Head Cam) to increase rpm and power for your engine.The only requirements for modifying DOHC to increase rpm while still retaining the same displacement (your 2 liter engine) is that you must be able to supply enough air and gas into the engine plus eninge parts should be forged and always make sure your clutch can handle the extra power you have just added.

Air Intake and ECU reprogramming only add a little power to your engine but it usually depends on the car. An exhaust upgrade while still keeping to catalyic converter will only give alittle power to your engine. AIR intake, ECU, exhaust and stripping parts don't cost as much as modifying your engine heavily but it will still cost some money yet it doesn't require you to use a outside garage to modify your car meaning you can just do it at your home.

These are just suggestions I'm giving to you, if you want to make sure  they work for you, go to your local car mechanic and ask him/her about this.