E46 Audio upgrade

Hi Guys,

I am starting to build a custom enclosure and porting system for my E46 330i.
I have done a couple audio systems in previous cars and have hopefully learnt from my mistakes to make this install the best so far. My current install was a compact 17 litre sealed enclosure for My JL Audio 10WXv2-4. The bass was tight but I struggled to achieve volume and presence within the cabin. So I am changing the setup to a Ported/Vented enclosure of approximately 28.3 litres. The subwoofer will face and fire directly through the ski hatch into the cabin while two ports will fire upwards into the cabin too, through the old spots for the rear parcel shelf speakers. Venting into the cabin via subwoofer placement and ports will hopefully give me the desired effect and outcome. Why have I decided to get rid of the rear parcel shelf speakers?
Well, firstly, they have deteriorated over their lifespan and are in a terrible state right now. Secondly, they are mid-bass drivers and thus with the subwoofer system being in such close proximity, their usefulness has been nullified, Rear fill can be performed by the dedicated mids in the rear doors. The subwoofer is being powered by an Alpine MRX F-35 bridged to provide between 150W-200W RMS power. Once funds come in, I will be installing a component split system up front, 5.25", powered by the spare channels left on the Alpine.

So today I am going looking for 3" PVC pipe and 3" Aero Ports, Once I've sorted out the plumbing, Ill be able to get cracking with the box. Here's some pics of the current state of affairs: