second 0-400m drag time

so i went to calder park again to try out my new mods:
AEM CAI, Magnaflow catback, take off the rear seats

i did 15.6sec @ 89mph on that day...

very disappointing for me but i guess i need vtec also need to use 17inch.... coz i think the 18 inch also affect the time... (its a common excuse for a slow poke )

AEM CAI

well... nothing wrong with my current modified airbox setup. but after tossing between upgrading my stock panel filter to K&N panel filter or just go for CAI system (cold air intake) i decided to go with a little bit more bling... lol

then i ordered my AEM CAI... took me and pehul27 3-4 hours to install it. (it meant to be 1 hr job) hueahahah... coz both of us dont know what we're doing.... and made lots of mistake...

anyway... here we go... finally installed...


and then me and visage did extra mod to complete it... we cut a hole on the wheel well and put an old speaker cover on it... we do this because the AEM CAI is directly above it....

Cat Back Setup

i need some more grunt . so here it is... my first performance mods...

de-restricted stock Intake (thx to visage):
- take off the resonator chambers on the intake... and leaving the stock airbox with stock filter on.
- put a flex pipe from the airbox to the front bumper grille to feed fresh air

benefit: higher air flow, more throttle response, nicer intake sound (esp on higher rev)


Exhaust:

this is stock mazda3 system (2inch):
- 4-1 header coupled with 1st cat
- then a second cat
- a pre-muffler
- a muffler


i use 2.5inch inlet and outlet magnaflow hi-flow SS muffler

then for the piping, i tried few different setups:
1. 2.25inch system with no second cat, with 2.25 resonator, and just 2.25 press bent pipe. still very restrictive.

2. no second cat and no resonator. replaced with 2.25inch mandrel bent pipe. higher flow but still very restrictive.

3. this is the last and the best setup so far. it is 2.5inch mandrel bent one piece straight pipe after the header and the first cat. all the way to the muffler, then press bent 2.25inch tail pipe after the muffler outlet for a bit of back pressure that was lost by opting 2.5inch pipe....