Bought a set of LS series coil pack for my Vette. One died after 2 years. I expected better reliability from a premium-priced product. I did not experience any improvement on the performance either relative to the stock coil pack.

I ordered some spark plug wires for my vehicle through this company and it was a bad experience! The website stated that they were in stock when in fact they were not in stock. I had to wait extra time to get them. Also upon first looking at the wires they looked and felt cheaply made. The wires I had on my vehicle prior to Granatelli are a lot less in price and are by far made way better and perform better. The Granatelli wires didnt even come with heat shields and the wires were pretty much all too short in length. When I say short I mean they were hugging my cast iron manifold! The boots of these wires are attached poorly also. I attempted to remove the Granatelli wires after getting a misfire going down the road and upon pulling them off the insides of the boots came apart. My NGK wires have never come apart had a loose fit or caused a misfire EVER! Yes, I know how to properly replace/remove spark plug wires. I spoke with someone at Granatelli in regards to my issues with the wires and I was told that they would compare these wires to the Motorcraft wires that came on my vehicle and send me pictures. Well, what do you know no one did that. Why? Because Granatelli isnt up to par with the factory wires. I also had to pay the shipping cost to send them back and a restocking fee. Based on my experience with this company I cannot recommend them nor will I ever do business with them again. Granatelli you may want to take lessons from NGK on how to make and manufacture quality OEM spark plug wires.

2010 SS Camaro- Jojo and the team really took care of me. Aside being a trusted name in performance. It is very easy to see why they are one of the best. From start to finish - small or large, you get honest answers as to what is viable for your particular performance need. I am BEYOND happy with the coils, intake (and a few other parts) purchased here. I will definitely be coming back soon for a few more!Product: 5 starsService: 5 starsQuality: 5 starsOverall: 5 starsI highly recommend this place!

Great resource for automotive expertise and excellence, experts in super charging and increasing the performance of your muscle car. They have created a science based formula for fine tuning and extracting the hidden power of your automobile. Racing is in this companies bloodline, they have been at the forefront of automotive enhancements for decades, if they cant help you find a solution, nobody can!

Horrible service and product knowledge. I purchased a new set of their LS billet valve covers from a private party and wanted to install them with new gaskets since they were a couple years old. Called and spoke to a tech on the phone. He said they dont carry the oring material but told me to get a 3mm oring that was 5 long to do both the covers and I would have extra. After ordering it from an oring supplier and trying to install it, its too short. Called them back to try and get a solution and was told a manager would have to call me back. After waiting 3 business days and no response, I called back. The manager told me they no longer make these parts and didnt know it was even on their website. I offered to buy new bolts and gaskets for the bolts and for them to throw in the oring, nope. Literally would not do anything to resolve their mistake. If they cant provide a solution to a simple $20 mistake and stand behind what they say, god forbid they really screwed something up. They will most definitely leave you out to dry and not be there if you need them.

No one ever quoted 15hp for Granatelli Near 0hm Wires.Not Granatelli and not J.R himself.I think this poster is thinking of up to 15% MPG. NOT HP.Anyway, best wires you can buy hands down. Nothing compares anywhere to what these can do. Tested myself with my DMM. These wires are the real deal.Thanks Granatelli. I will only use your wires from now on.

I needed a set of custom length plug wires in a reasonable timeframe, after competitors told me 3-4 weeks to make the wires, I called Granatelli and was able to place a order with JoJo trouble free... would highly recommend this company.

Just received my 1G suspension kit. Installation was a breeze. The kit is very well made. Looks great on my Gen 5 2013 SS Camaro.

Granatelli motorsports goes above and beyond for their customers and always gets the job done amazing business !

Great place to work!

I brought my 2015 1500 silverado in to get the coils and wire upgrade and WOW did they make a difference. Thank you for make such amazing parts

Wires from Granatelli gave me 16 more horsepower and Ive never had a bad experience there. In fact I liked and trusted Granatelli so much I sold my 97 custom Softail Harley and had Granatelli install TwinTurbos. Next I had Granatelli install there 1g suspension and that gave me a much greater cornering. In the past few years Ive had dozens of my friends family and coworkers go to Granatelli most who are cops and firemen. No complaints about price and we all know you get what you pay for so we never go bottom bed. Granatelli gives you a lot of top quality equipment for your money. And Im not rich but the guys who are cant compete with my car. Thank you granatelli motor sports I even got an STP sticker.

I had a fair experience at granatelli. I ordered simple carburetor upgrades for my old school chevy mustang. Parts quoted at 300. Okay.Squirting out about 178 hp at 19,000rpm. OMG J.R is the mans man.He gave my super valuable American crpblock a WHOPPING 5 more horsepower and a carburetor sync for only 2500$. I found out they only did a carb clean and put 110 octane in it to make it feel like it had more power I was utterly ripped off by these clowns. Save your money and put it towards something that will actually do more than a 110 mph. Go pick a tuner car you bunch pansies. American cars eat poop. And so does Granatelli Motorsports. ;)

Bought some cutouts for ctsv and 1 failed called them up they where nothing but helpful and friendly sent me a new cut out within a week

They blew my brand new motor up on their dyno. They took Zero responsibility. Avoid this scandalous shop

Going to send in some coil packs to have tested under warranty work And they want $35 to do that will never buy from GMS ever again

I just put on your spark plug wires and new E3.54 spark plugs you wouldnt think it would make a difference but the minute I cracked the throttle I felt the difference its true you get what you pay for .