Field manual

Guides

Practical answers for builders — grounded in the real installs, costs, and dyno numbers documented on Car Profyl.

What a Tune Actually Does (And What to Ask Your Tuner)

A tune isn't magic horsepower in a USB stick — here's what it actually changes and what to ask before you hand over your keys.

Big Brakes: When You Actually Need Them (And When You Don't)

Big brake kits look great and stop hard — but most street cars don't need them. Here's how to know when a BBK is worth it and when to save your money.

Selling a Modified Car: How a Documented History Raises the Price

A folder of receipts and dyno sheets is worth real money when you sell a modified car — here's how to prove your build and stop leaving cash on the table.

QR Stickers at Car Shows: Turn Parked-Car Traffic Into Followers

Your car does the talking at a show — a QR sticker makes sure the crowd can actually find your build afterward.

How to Pick a Performance Shop You Can Trust

A practical guide to vetting a performance shop before you hand over your keys and your build budget.

PPF vs Ceramic Coating: Protecting a Show Car on a Budget

Which actually protects your paint — PPF or ceramic coating? Here's the honest breakdown for show car owners working with a real budget.

Valved Maxflo Exhaust System: Cost, HP Gains & Who's Running It

What the Valved Maxflo Exhaust System actually costs, what it gains on the dyno, and whether it's worth the money.

Best Mods for the Chevrolet Corvette: What Real Builds Run

A breakdown of the best Corvette mods based on real documented builds, logged parts, and dyno-backed HP gains — not forum guesswork.

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