I'm looking to upgrade my 2.7 TDI S line's horse power, which is the best way to achieve this for around 1k?

Currently it is 190bhp.

Welcome to the forum :) 

I would say a good induction kit, stainless exhaust and ecru remap :) 

Cheers

Steve 

A grand is a good budget to work with actually. Mr Q is definately right about the remap, you should get 230-250 BHP quite easily with standard turbo but the IC would need upgrading too. I believe the turbo would then become your first limiting factor. I am not sure when you would need to upgrade injectors on this engine. Personally I don't think you need to upgrade the exhaust unless you want to go way past 300bhp. Speak with a local Pendle agent http://www.pendleperformance.com/agents.php ( link for finding your nearest one.  They are really good with VAG software.

Dont muck about with performance air filters, they are a bit of a con. Give your car a good service, fresh fuel air and oil filters OEM!!  And an oil change. Then get it remapped. And a new IC if wanting to go over 230bhp.

A bloke got his 3.0 TDI to over 400bhp, so there is great scope for these V6's. :D 

 

Final suggestion from me, if you have a DPF delete I would opt for a dummy box and insist on keeping the old one. If the proposed changes to the emissions test for MOT does come in, you may need to refit it to pass!!