Psiperformance Reviews 

Disappointing experience with PSI Performance – product not as described and unresolved reimbursement

I purchased an Interchiller kit from PSI Performance on 9 September 2026 after being assured it was in stock in Australia. This was particularly important as my vehicle was awaiting installation and tuning.

The kit was advertised on their website for $2,686.99, but I initially received a quote for $5,300. After questioning the difference, I was informed this was an error involving a Stage 2 kit. I subsequently paid $3,790 plus $280 postage for what I was told would be a custom Stage 1 kit specifically fabricated for my Mercedes M274 engine.

After several weeks without tracking information, I contacted the business multiple times. I was eventually informed that the kit was actually being shipped from the United States, despite my understanding that it was already available in Australia.

The kit arrived on 21 October 2026, more than six weeks after purchase. Unfortunately, the product was labelled “Universal Kit” rather than being specifically manufactured for my vehicle as I had understood. It also appeared to be missing components, including hoses, meaning my workshop needed to undertake additional fabrication and installation work at my expense.

I raised these concerns with the business and provided photographs of the product received.

Following further correspondence, I was advised that the additional costs would be reimbursed, with payment and written confirmation expected on 5 November 2026.

Unfortunately, neither the payment nor confirmation was received by that date.

I made several further attempts to resolve the matter through telephone calls and messages. Communication became increasingly difficult, and I subsequently found that my telephone number had been blocked.

I am extremely disappointed with the overall experience, particularly the differences between what I understood I was purchasing and what was ultimately supplied, the lengthy delivery period and the unresolved reimbursement.

I have retained invoices, photographs and correspondence supporting my account and am happy to provide these to Trustpilot for verification if requested.

Based on my personal experience, I would not purchase from PSI Performance again. I hope sharing my experience helps other customers make an informed decision.

Unfortunately, my experience mirrors other reviews. After the work was carried out, an exhaust leak appeared that resulted from the original installation. Matt attributed the ticking noise to the exhaust leak, but no action was offered to fix it. I then had to pay another mechanic $300 to repair the exhaust, yet the ticking continues. As a result of his errors, I now have to have the top end rebuilt again to correct the work. While communication upfront was clear, follow-through on promised inspections and warranty coverage was lacking. Overall, the workmanship did not meet expectations, and accountability for the completed work was not demonstrated.

Once you'd paid the service stops! One week after pickup there is metal in my oil, noisy brand new "lifters" horrible experience, do not recommend. Over 10000 spent, now my engine is rubbish. Really defensive and smart over the phone and in person, wants to charge the same amount to fix their stuff ups! AVOID