erm is this bad!!

http://a01-b01.mypicturetown.com/P2P...reenHeight=768

hi there

new to the site so trying to upload pictures

went off roading this weekend with my new terrano. After constant micky taking from my work mates about how bad terranos were offroad i had to show them. I think i went a bit too far. I was against a landy 90 and a £150 suzi sj so i didnt want to let you lot down. However i now have massive power loss. i took the air filter out but no difference, and i gave the maf a wipe but hasn't changed i've got a feeling that its the turbo. so if anybody knows a quick way of checking to see if the turbo is functioning as it should, please let me know. the turbo is still caked in mud so i have a busy night ahead of me tomorrow