Depends how much you want to spend. I have done a couple of variants.
1. Garndi chip is good idea. Can buy off gtaye on redlinegti. Generally good for up to about 10psi with standard fuelling system. Chip was fine for standard 91 RON fuel in Australia but I would recommend premium for a little engine protection.
2. Look after the gearbox. suggest a LSD of some sort, even a phantom grip style. Wheel spin is the enemy. good quality gearbox oil.
3. Look at fuelling, FPR is possibly needed (dyno to check). If you have enough headroom with injector flow avoid FPR as the next weakest link in chain is fuel pump as increase in pressure will drop its flow. Suggest walbro or similar in tank as good effective upgrade.
4. Don't need upgraded fuel rail in my opinion, MK3 or MK2 is fine.
5. Check compression on engine to make sure healthy as it will show up issues quickly and accelerate wear.
6. Properly gapped good quality copper plugs and leads. Plan to replace more regularly for best results. Sometimes you might need to look at coil upgrade (some are better than others).
7. Decent properly sized intercooler. Don't go too big as it will create lag and too much pressure drop.
8. Decent turbo not too big. If you want to get decent quality new, something like a garret GT2554 is really good. I had boost pretty much from 1500rpm with one. Second hand td04 off a WRX or similar sized bush bearing turbo or similar will do the job at a good price.
9. Low boost means log manifold will be fine and have short pipes which helps spool.
10. 2+ inch exhaust system helps. I have a 2.25" stainless mandrel bend system which I had from the original 130hp system to the current 280hp system
11. Don't oversize piping and keep bends and length of piping to a minimum.
12. Look at where MAF sensor is placed in the system as some people issues (look at other setups)
13. Use a BPV (a recirculating BOV) as vent to air will mess with the air measuring by the system.
14. Decent heavy duty clutch also very worthwhile.
Some other things that are good with the system are things like an oversized throttle body (some go for 60mm TB but for road car I would go max to 50mm) and cultus intake manifold.
Of course more power should mean more stopping power. Decent tyres and brake pads would be good.
Hope that helps in some way.
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ET 13.138 at 120.2mph
