I just got an 89 IROC and was looking to install a subframe connector and tower brace. Which manufacturer has the best products?

Depends what style you want. Spohn and BMR have good products as do many others.

It would be wise to make sure your front end is pretty solid, rebuilding it would do wonders if everything is 21 years old. I'm still itching to see how mine is going to do since I've rebuilt it. Its sitting on the rack waiting for the exhaust to be welded up :/ Also with a strut tower brace, using solid strut mounts would greatly benefit you. Using the search feature helped me out a lot when I was reviewing everyone's input on suspension products.

Thanks guys. I just bought this car and I love it. Looking forward to upgrading.

Hotchkis all the way. Love every component I've ever bought from them. Not only do they stand out under the hood/car, but they perform as intended.

Will