Discussion
Your cat has almost certainly colapsed or melted or is just bunged up. I found replacing mine really helped. If you replace the cat you'll probably want to put your muffler back on else it will sound like a Nitro Tractor, which if fine, if you like that sort of thing.
Headers would be the next thing, they won't make a massive difference to BHP but will improve torque and spool up the turbo faster. However, there are a number of header designs in the market that will give massive BHP increase. This has nothing to do with the headers but rather the wastegate pipe causing overboost.
Headers would be the next thing, they won't make a massive difference to BHP but will improve torque and spool up the turbo faster. However, there are a number of header designs in the market that will give massive BHP increase. This has nothing to do with the headers but rather the wastegate pipe causing overboost.
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