A2k00

My 03 STI

TD05 18g Turbo
HKS SSQV
3" Decat (think it goes to a 2.5" at the bottom)
Standard PPP Mid pipe
ProDrive muffler
Ported and polished headers
Gems ECU
Running 312whp

The car is a little too quiet for me so was going to replace the resonated ppp mid pipe.

Do I go 2.5" or 3" will it make more less power or noise with 3"?

A2k00

Anyone?

BrownPantsRacing

iTrader: (6)

Can't be 312 WHP can it? Wheel horse power?

Personally I'd stay with the 2.5" pipe size you have and just go for de-resonated centre section. MAY not need a re-map as ECU might fuel correct enough.

A2k00

Many thanks for reply, think i will stick with 2.5"

As far as power goes, all I am going on is this Dyno that came with the car



Was taken at AME on their hub dyno so the print out is at the wheels power

BrownPantsRacing

iTrader: (6)

Ah right. Makes sense. a Hub dyno is not strictly WHP figure. As the name suggests it's a figure at the hubs and does not take into account energy lost through tyre friction etc.

Still, looks like the car is fun!

A2k00

Ah cool everydays a school day :-)

Rough guess then what the above dyno would be at the fly? I'm hoping the GEMS should deal with the new mid and not need a remap. I have a wide and AFR gauge in the cab so can keep an eye on it

BrownPantsRacing

iTrader: (6)

Very difficult one to answer that.