Hang on just a second here people! Unless the Engineering requirements changed overnight there is some real misinformation here. I can only speak for NSW regulations so sorry to the interstaters but Engineering concerns are something I deal with on a weekly basis. Firstly there is a broad suggestion here that if you have the APS kit all is sweet and dandy. Just to clarify something here. Whilst when tuned correctly I'm sure it can all be sweet and dandy, but UNLESS you have your SPECIFIC mods and your SPECIFIC vehicle engineered you're just as defectable as everyone else. Any performance changes to your car can be used as a defectable offence by the police/RTA unless you have your car engineered. This however is a relatively easy thing to do and in the scheme of things is quite inexpensive. An engineers certificate can ONLY be provided by an approved RTA signatory. There is a worksheet available from the RTA that lists them. It is Vehicle Standards Information Sheet no.15. You can also download the PDF here: http://www.rta.nsw.gov.au/heavyvehicles/do...s/vsi/vsi15.pdf Expect it cost anywhere from $500 and up for the paperwork, but hey what did the car cost you ?? There are 4 basic area's of concern with the XR6T upgrade packages in terms of engineering. (Any car for that matter) Emissions Exhaust Intake BOV There are plenty of finer points but the basic requirements aren't that hard to meet. Firstly, Emissions - In NSW the EPA encourages tuners and vehicle owners to have their cars meet the emission requirements. As such the rolling road emissions test (which is all your engineer requires) is FREE as part of any blue slip or engineering certificate requirement. All you need to do is book a time at the Penrith testing centre (Only open Mondays and Tuesdays). They are good guys and don't black mark you if fail. They are there to help. If your car has been tuned to suit then just about any quality ECU or Piggyback can pass. By the same token your chances are only as good as your tuner and it can take an attempt or two to pass. Remember no Tuning workshop in existence has the same testing gear as the RTA. They don't just test what comes out the pipe. They suck ALL the air out of the room ! Exhaust - There are some basic requirements - keep it under the legal noise limit, it MUST have a catalytic converter. Of course keep your ground clearance requirements in mind. Rule of thumb 100mm ground clearance is a must. Intake - Intake mods have some noise limitations as well but basically, Pod filters are frowned on so the best way to go is with a panel filter in the factory airbox. Speak to your engineer for the finer points BOV - You can change your Blow off Valve BUT it MUST be a plumb back or recirculating type. There are many areas that can be considered for engineering. Wheels, tyres , suspension etc all needs to be engineered as well, but this thread was about performance enhancing parts and tuning so I am sticking to that. If you really want to get into it, the RTA can provide the exact standards a 2003/2004 car has to meet. I don't have those worksheets with me right now. Sorry its such a long post but I lurk around here a lot and generally keep to myself. My guys (I am president of a modified car club) get misinformed about stuff all the time and it's just a pet hate of mine. Too many people are scared to modify their cars because they have been told the wrong thing and that's not good for any of us. Brian, I know your not concerned about it but, to the best of my knowledge, if given an emissions tune there is no reason your car cannot be engineered. There is certainly nothing that makes the APS kit anymore engineerable than anyone else's (Sorry Peter) Thanks for listening and I hope that helps everyone. I'm back off under the rock I crawled out from under lol
