Jesse Williams

Aftermarket CATs will give you a engine light as fords only like 'euro' cats. This will result in your system leaning out and potential detonation. Replacing the CAT requires a flash tune. Done alot of research recently with the exhaust side. Replacing your o2 sensor will make the car run alot nicer.

Got half way through reading these replies and decided to skip the rest, so this may have already been covered. If you change to a high-flow cat, then you will need a tune because the after-cat o2 sensor won't work properly and cause it to lean out, this requiring a tune. Cat-back you won't need to do anything, other than try and refit the after-cat o2 sensor. If you have a BF or BF mkII then the computer will relearn if you install a larger dump pipe. Basically, of you change the cat, you require a tune.

Ahh ok. Upsetting, but atleast I didn't waste my money on a boost controller then find this out the hard way haha. Thanks for the info

Im looking at getting an Electronic Boost Controller for my MKII BF Turbz, and just wondering if anyone knows if the factory ECU will like the boost controller or not? Any hints on installing it? etc. The rest of the car is completely stock standard, other than the bolt-on intercooler upgrade.

My local performance shop (Fisher Performance) in Adelaide told me that with my BF MKII I can achieve 300+rwkw EASY with a decent exhaust (3.5" dump + 2.5" twin back + high flow cat) valued around $2200 and a good flash tune for $1500. Now, that seems pretty decent despite not changing any internals or the fuel system.

I ended up shooting around to one of the performance mechanics in my area, despite being a public holiday, there was someone there. He told me regardless of the gauge type, teeing off the BOV will work. Shot down to Sprint Auto Parts and picked up a couple fittings, teed off the vacuum hose from the BOV and all works beautifully. Thanks for the help!

Hi all, I've done some searching on the forums but haven't come across anyone with a gauge that doesn't measure vacuum. I have a mechanical boost gauge that measures 0-35psi boost, and I'm just wondering where the best place to pickup my boost reading from is? Is the BOV still the best idea seeing as I dont have vacuum readings? Will it damage the gauge if it tries to read vacuum? Pictures of fittings would be greatly appreciated Cheers