Manley Pontiac 400-428-455 1.770 Race Master Exhaust Valves (Set of 8)

The product was originally marked for 2005 and up gx470. I managed to fit it into my 2003 by flipping one of the front hanger mounts. Sound is throaty and deep a bit loud at first. But the sound has mellowed out after a few hundred miles. Hardest part was removing old exhaust had to use Sawzall. Make sure to buy the 2.5 donut gasket ahead of time. The system is high clearance. Its tucked between the frames no chance of hang ups.

It’s the best mod I’ve done. Should have been the first thing I did.

Brian was extremely kind and helpful to make sure I was getting set up with the correct products. The Brey Krause harness bar is extremely high quality. Don’t cheap out on safety stuff this is definitely the harness bar you want in your c5. The combination of great service from Brian and the quick arrival I highly recommend FI Performance and will definitely be using them in the future!

Five stars for the parts and service. Ride quality is better than expected for a coilover setup. And Brian was super helpful in getting the correct setup for my truck

Fits perfectly and does exactly what it needs to do. No complaints.

Brian recommended these end links after sharing my plans to do some HPDE, Autocross and Street driving for the C5 Z06. The parts feel great, I did have a warranty issue that was addressed by both Brian and AFE, I was very satisfied that they took care of my issue in a timely manner as well. Highly recommend both Brian and AFE, thank you as always for your help!

Brian definitely knows his stuff, he recommended these after asking what my plans were for the car. This is a huge upgrade to my C5 Z06 and the ride quality is tight and feels great!

Came packaged well, looks great fit as it should. Much better than other cabon hoods I have bought in the past. Brian's customer service and willingness to assist is second to none!

I purchased a kit from Brian with Swift springs. I must say that the quality, fitment and easy install was awesome.
Beeing a racercar driver I have dealt with many sorts of coil over kits. I have also attended to several car/racecar projects. So my experience with coil over systems is wide. Like Reigers from wrc, Øhlins, Team Dynamics etc etc..
The installation is easy but use time to do things properly.
Very lightweight but also seems very well built dampers.
It is easy to adjust height and stiffness. But I will recommend to do this very carefully and with some patience.
Brian is a very nice guy and very fast to answear questions. So thumbs up for him.
All in all I would highly recommend this product. My Z06 did get a much better grip and feel in corners and the car became perfect on bumpy tarmac roads.
No need to scroll the internet for several different brands. This is a great value for the money to any use of your car.
Thanks again Brian for great service and a great product.

These have been great for me. I haven't taken them to the track yet, but they ride very nice and can go lower than you'll want to!

Shipped super quick, customer service is always fantastic. Mounts themselves fit great and will help put down all the power. Paired with their engine mounts it will add some NVH, but nothing extreme. I cant hear it over the bald eagles anyways

Brian got me all fixed up I was having a lot of trouble getting this oil pan locked down from other places and he was able to get me the full story on why it was so difficult to get but he got me on the list for one and got it in about two weeks including production time this place is great!

Quality was top notch. Install and fit was perfect. Thank you to Brian for going out of his way to get these to me.