With circa 400bhp i'm not removing the cats to try and chase anymore power. They are showing some signs of damage so taking the opportunity to start the progress of replacing the exhaust system for a wider bore stainless one (was thinking 3", though it's tight over the axle so looks like 2&3/4'' will likely be the max) and fabrication replacing the cats and centre section is fairly straight forward. The rear section is more effort and cost and will be done once I know the car is in full health and saved some more pennies!

I'm not looking to rev the nuts off her but the history and spec of past engine replacement and rebuild confirms she has a forged short block bottom end, forged pistons & con rods from Sean Hyland Motorsport amongst a number of other upgrades. So she 'should' be pretty robust.