Outer Limits 4x4 Board

Just got a 04 rodeo turbo diesel with 120 on clock.
Wanting a little more out of it when towing bike trailer,so my minister for finance says limited budget heavily enforced.
Should I get a FULL 3inch system and save for DP chip or get chip and cut out muffler and weld straight thru pipe in for now.
I know I should wait and save for both but can't wait think I have A.D.D.
Any other mods or power upgrades much appreciated.
Cheers

double post

Have both a chip and exhaust. The chip makes the most gain. the exhaust was done before the chip and made only a little difference. I had a dp chip and after returning it back to them twice for tuning i requested a refund. Now running a tunit. All Good.