Full fat Stage 3 setup

[HDi--Power]

my current setup is as follows

Old gated, IHI-RHF5
2.5inch stainless into 2.25decat into a 2.0inch tail and backbox
running stable 24psi
GRS motorsport frontmount intercooler and 2inch piping..
the manifold is ported, and the exit matched to the hotside turbo inlet size and it's sorted.

its remapped by hdi-steve and its f*cking quick..

as i am sure jonny will suggest a 3inch outlet would be better for the hotside but i went with 2.5 for sound.. and it sounds LOVELY!,

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i should point out that this map is using the STOCK 1300bar rail pressure sensor, and R70 pump..

i am led to believe that having these (if i remember the conversation correctly) improves the ability to refine the injection timings (more options) and duration.  leaving a cleaner map.

i will be getting them eventually (just not yet) and then speaking nicely to steve as well

but this just goes to show that they are not an absolute requirement for a stage 3

I'm not sure 3" would be best, but a 2.75" downpipe would probably be better for flow.

Also, stock sensor is 1500BAR.

As Ruan says though, these will make good power if mapped properly on a healthy stock injection system with a decent exhaust and intercooler setup, and a  bigger turbocharger (choice of turbo will obviously affect driveability/power band). 

Once you have that sort of setup, start looking to improve. Work with the mapper, iron out faults as you increase the power and you'll find yourself with a very quick car.

fixed that for you