Holden Commodore 2004 Problems

WITH that, you're looking at either a Falcon or a Commodore. On the Ford side you could look at an AUIII Falcon or a BA six-cylinder which has a towing capacity of 2300kg in auto form. Across the divide there's the VXII or VY Commodore that will handle up to 2100kg. As for which is the more reliable, I would lean slightly towards the Commodore.

We checked with Peter Schweighofer of Swift Automotive in Melbourne who recommends the HM headers and exhaust system. If your car is an auto, he also recommends you have the shift pattern altered to make it sharper.

Sounds like you've got a nice FE there, Jason. I don't have any experience with devices like the fuel catalyst, but am sceptical of the claims made by their makers. You can modify your engine to run on unleaded fuel and that's what I would recommend. Any reputable engine builder can carry out the modifications, which involves fitting hardened valve seats to the cylinder head, and hardened valves. All that's doing is reducing the valve-seat wear which increases without the presence of lead, which acts like a lubricant on the valves and valve seats. It's also necessary to retard the spark on some engines so they run on ULP, although they might run quite happily on the higher octane PULP. I'd expect your engine, with its modest compression ratio of 6.8 to 1, to run quite happily on 91 octane ULP, but if it pings try PULP, or have the distributor modified.

BOTH the Falcon and the Commodore convert well to LPG. The taxi industry runs both successfully on it, and they are the toughest when it comes to finding out a car's weakness. Ford has probably done more work with LPG on its Falcon, and has a dedicated LPG option, but there's no problem with converting the Commodore.