Altech Performance - Honda Acura Repairs & Maintenance Toronto. They do have a good reputation, I've learned but that is very subjective to each individual. You may have to travel but I'm sure it would be well worth the effort to get the jobs done right! It's only 113 miles away. Not far for that kind of work.
I think you have some great mods in the making! Honda Si's can be made to go really go fast. Let us know how it turns out and welcome to the forum!