I worked with Jen and Nick to set up my NA Miata for autocross. They were responsive and able to give a detailed and well priced quote over email.When I dropped off the car Nick went over all the work and details about what would be done and answered any questions I might have. It was clear he knew what he was talking about when it comes to building cars and would be taking good care of my Miata!I am very happy with the work that was done, everything was professionally installed within 24 hours, car is driving great, and thanks to 5523 I’m ready to race. Will be taking any other work needed to them in the future.

Nick is the man! I had him do all my machining/balancing/ring filing/etc. He even ordered all the hard to find parts for my RB20DET. Once all the parts came in (this took a while, but was completely out of his hands) he buttoned everything up fairly quickly. He even filed my rings and steered me in the right direction for assembly. My Rb20det now screams making 371 whp ! 10/10 would recommend him for all your RB / VQ / SR / Nissan needs!!

Nick is a master! I have yet find anyone on the western US that knows as much as he does about 2-3 (Ni-san)!!! I owe him big time and will always refer everyone I know to him!

Nick was great. Very knowledgeable on the Z chassis. Will be returning for more work.

Very knowledgeable. Got some cool cars there

5523 is a great place to get work done on your car or truck. Both Nick and Jen are very knowledgeable and have a great attention to detail. Nick is very meticulous when he assembles his motors. He is always willing to explain and teach you what he is doing and why he does it the way he does. He is very versatile and can build pretty much anything. He has built 3 motors for me for various applications and if I need work done this is the only show I will go to. Thank you guys for taking pride in what you do and taking the time to explain things.

Jen and Nick are some of the most knowledgeable people Ive met when it comes to cars. Ive known Jen for years and she is as solid as they come. Give them a chance you will not be disappointed with the level of customer service or attention to detail. Their no bs approach is second to none. 5523 will not cut corners nor lie to you about whats possible with your build and what isnt. Give 5523 your support and in turn you will get work done by one of the best in the business.

Nick and Jen are very knowledgeable and thorough regarding their work. They are always willing to communicate with customers and potential customers alike. Their passion for performance automotive work really shows. They are a great asset to the car enthusiast community.

Nick and Jen have great customer service! Spoke with both of them in complete detail in regards to the work that needed to be done and came out amazing! Definitely recommend 5523 motorsports to anyone needing work done to there car or truck. Very meticulously when paying attention to detail 👌!

They rebuilt the engine in my 2002 Mazda Miata, tuned and have answered many questions to other areas of my time attack build. Theyre pretty average as far as prices go in the SoCal area but their knowledge is top notch. I recommend them to all of my friends for the past several years and they have never let me down.

You want sh** builds then go somewhere else but if you want builds from people who know what they are doing and will give you a great quality product then go to 5523. They have an extremely knowledgeable staff that will bend over backwards for thier customers. Just do yourself a huge favor and give them a shot you will NOT be dissapointed.

I have been doing business with Jen and Nick for over 5 years now, theyve both been very helpful with my builds and are a wealth of knowledge in all things automotive. Their quality of work speaks for itself, wouldnt hesitate to spend my time and money with 5523 Motorsports.

Some of the most knowledgeable and helpful people in the industry. Serious builds to boot, just look at their website. Moto IQ landspeed 240...need I say anymore? The few on here that have left bad reviews want work for free or dont want to pay for quality. If you want hand holding and the cheapest prices, this is not the place. If you want HONESTY, top notch work using top of the line materials and techniques, youve come to the right place. Only place I trust to touch my cars.

Most knowledgeable shop Ive come across since moving to Ca. Amazing custom wiring harnesses built here too.

5523 Motorsports ordered me a new clutch and flywheel for my rx8. Over 3 years later it is still working like new. Thanks to Jen for getting my my parts shipped asap!

Good people and reliable work! If I need any car related work done they are my first go to!

Rebuilt my motor on my 22re. When the motor was completed, it leaked from every seal and had a bad wrist pin. The motor will have to be rebuilt again by someone else.

Ive bought and ordered multiple parts from them for my SR20. They were easy to deal with, verified what I needed would achieve my power goals and everything showed up quickly. Ive never hestitated to order from them again.

Great people, great work.

If you need an engine build or a brake job this is the place to get it done! A+

They helped me with my turboed 350z when it was making a weird noise and they helped me fix some problems from the out of state install.