Hi everyone, can someone please advise me on a good ko3s upgrade. I dont want to go ko4 route.

I was a little disappointed with the results my car made from the following bolt ons

pro alloy front mount cooler

440cc injectors bosh green giants

aps 265L fuel pump

ram air induction

miltek turbo back with 3” downpipe/200cell sports cat

usual delete mods

forge diverter valve

Maf and tip are standard

 

 

ive attached what my car made and since then ive ordered an sfs oversized tip, i am also gonna go back to an oem diverter valve new one. I have also got my hands on an agu boost pipe that goes from pancake pipe as the auq ones are prone to boost leaks.

Also i am tempted to buy an ebay 3” downpipe and decat. They like £100 compared to milteks which is £249. Thoughts on these appreciated.

 

With that all said what would be a good turbo upgrade? A bbt 300? Mine already has a new hybrid Ko3s but it just didnt make the numbers i was hoping, there was slight twisting movement between the exhaust turbine housing and the compressor housing but the mechanic didnt want to tighten the attached bolts too much in fear of snapping the threads. Ive attached pics for better explanation.

 

So the arrows marked yellow that was where the twisting movement occurred by about 5mm. Could that be a cause of boost leak. The six collar bolts how tight should they be?

 

ideally i wana be hitting 270hp with close to 300ft/lb

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F123609702995

 

This was the decat i was looking at

I have one of those downpipes and decats on mine and when I fitted it along with oversize TIP and my custom intercooler pipework, the improved flow saw an increase of 10bhp and about 30ftlb of torque.