I can't really say I have done any "hard" mods to my car. Most all are cosmetic. Here is my best and most "time consuming" mod to date:

 

By far the best and the easiest is the Eurotune. Those guys are great

 

Have you been to Carters in greenland nh? Those guys are MB gods when it comes to wrenching.

 

Please do, that is awesome!

 

Oops! Thant's what I meant. 2nd Armor, Hell on Wheels. Was there 1978-79 and then again in 84 - 85.

 

best to date hmm stir radar detector stealth install i did.. its saved me a lot of money from possible speeding tickets.

the hardest is still in the works with the twincharging of the crossfire tuned to 454hp to the ground and now building the engine to handle even more hp and lowering the compression. ill give alot more info on this once i get it from the shop

 

Getting somebody to build my hood was by far the hardest thing with my BEST mod. It wound up taking 2.5 years from conception to completion.

https://www.crossfireforum.org/forum...brication.html

Even though it wound up costing me twice as much as originally planned, it turned out even better than I had hoped.
It turns more heads than my Dodge. But I suppose debadging and rebadaging helps add to the confusion.

 

Hardest by far was also the most time consumming and that would be the Momo steering wheel swap.
altering the stock clock spring was a pain but would love to try it again just to attempt a cleaner wiring set up.
My favorite has been the power improvments.
LOVE BEING ABLE TO OUT RUN ALMOST ANYTHING YOU DRIVE UP NEXT TO.

 

Ok, the hardest for me was spending 1 hour outside the autozone with two employee's trying to put the rainx wipers on the car. We could never put them on, so I bought the bosch wipers instead and put them on in five minutes or so.

For the easy part on the car, was the magnaflow catback exhaust. Which also the best one yet.

 

by far the hardest mod was installing the wavetrac diff. the best mod was a three part mod, c3 n/w dual cai and tune. by far the best!

 

My hardest Mod? Over two years figuring out how to make the sound of a V8 come out of my Ansa muffler. The next hardest thing was my rear brake upgrade and figuring out how to adapt S65 rear calipers to mount on my car.