are the chips worth it or is it better to mod exhuast or chips. or am i missing something. looking at engiune rebuild shotly so exreme mods very welcome.
The squadra chip, or any other off the shelf chip is only worth it if you're not going to modify your engine in any other way.
Are there any companies in your region that sell remaps, and that have a rolling road? If so, I would get a custom remap there after I'm happy with the rest of the modifications I've made...
I think with the stock engine, and stock ecu, including a remap, you'd need a very good exhaust and intake system to hit 170 bhp... Both the AFM and the injectors (80% duty cycle) are sized for 140 bhp, so the only real way to improve the output without changing those is to improve the brake specific fuel consumption, (except you can change the fuel pressure regulator which again requires a remap to keep the engine from going too rich under full throttle)... This is basically what a remap does... but you could also skim the head or fit high compression pistons to increase the compression ratio... Basically it pays to make mods that don't require extra fuel or air in the engine, as those are bottlenecked already.
Funky cams are a bit of a grey area, they don't give more bhp than the stock items, but do allow the engine to keep the torque more high than the original ones, so power doesn't drop as quickly after 6000 RPM. Downside is that this requires the removal of the phase variator, and thus reduces the power output at low RPM significantly.
example: Squadra Tuning
A free and easy mod you could try is retarding the exhaust cam a few degrees, to favour high rpms over low, but this seems to work best on 1.8 engines since they aren't as limited by the AFM and injectors.
If you are willing to go more extreme, that's a whole other story, and a lot more can beachieved, but the price tag is accordingly....
in handling department have got top springs, a.r.b.s and shocks. what more can be done.
Probably the best mod for the 155 is to setup the rear brake bias valve properly... It's located under the car by the rear arb, just in front of the tank. here you can give the car more rear brake bias, or less, as you prefer. By givinbg it more, the front brakes are relieved quitre a bit, and you can use the brake for trail braking more effectively... the standard setup says to hang a 5kg weight on the little arm of the brake bias valve and to undo + do the nut holding it. if you add more weight, the bias to the rear will be higher... if after a good raz your rear brakes aren't sizzling hot, the bias needs adjusting
A good set of pads and discs + some DOT5.1 racing fluid will not be out of place also... I'm using Sparco T-51 pads, which seem to last forever, probaly outlasting my EBC drilled and grooved discs, but Ferodo DS2500 will be similar in performance, if not better...
Hope this gets you in the right direction, don't hesitate to ask if i didn't make myself clear... The most important thing to do is to decide where you are going with this, and what you are willing to spend....