In the last installment we left off installing and dyno testing Pypes hi-flow exhaust system on our buddy Tim Cairone's '87 Buick Grand National. We realized gains of 38 hp and 35 lb-ft by ditching ...

When two equal turbochargers work independently, it's parallel. If a small turbocharger operates at lower rpm, then a larger one at higher rpm, it's sequential.

HOT ROD has long considered turbocharging the performance tool most compatible with the ever-increasing need for power which can be delivered with economy and low emission levels. The induced ...

Automakers are leaning hard on twin turbos to squeeze more power from smaller engines, promising big performance without a brutal fuel bill. The reality is more nuanced, with real-world mileage ...