Skunk2 Pro Series H22 Intake Manifold: Prelude Guide

The Skunk2 Pro Series H22 intake manifold is the single most recognizable bolt-on for the H-series Honda Prelude, and for good reason: it throws out the restrictive factory dual-stage casting and replaces it with a one-piece, high-velocity design built to chase the H22's screaming 7,000-plus-RPM top end. If you own a 1993-2001 Honda Prelude with the H22A or a swapped F20B, this is the intake manifold the build community keeps coming back to. In this guide we cover exactly what it does, the real-world horsepower picture, fitment across H22A1 and H22A4 cars, what the install actually involves, and the in-stock parts that finish the job — all from our shop here in Tampa, FL.

What Is the Skunk2 Pro Series H22 Intake Manifold?

The Skunk2 Pro Series intake manifold (part number 307-05-0301, Black) is a one-piece, cast-aluminum replacement manifold for the Honda H22A and F20B engines. It is a direct, OEM-style bolt-on that swaps the factory dual-stage manifold — with its restrictive intake-air-bypass (IAB) butterflies and EGR plumbing — for a single-stage design featuring an oversized plenum and long, tapered, high-velocity runners. The result is straighter, less-restricted airflow at the high RPM where the H22 lives.

Skunk2 casts each Pro Series manifold from aircraft-grade A356 aluminum with intentionally thick walls, so high-horsepower builders can port and inlet-match the runners. The manifold retains the factory 70mm throttle body opening (and can be machined to 74mm for a larger unit), reuses your OEM fuel rail, injectors, and sensors, and arrives in a durable black finish with the Pro Series nameplate. Every unit is vacuum-tested before it leaves the factory.

Single-Stage vs. the OEM Dual-Stage Manifold

The factory H22 manifold is a dual-stage design: it uses intake-air-bypass (IAB) butterflies to switch between a longer runner path for low-RPM torque and a shorter path that opens up at higher RPM, plus an EGR circuit bolted into the casting. It is a clever compromise for a daily-driven OEM car, but those butterflies, the EGR passage, and the cast-in shaft all add restriction and turbulence right where a built H22 wants clean, fast airflow. The Skunk2 Pro Series commits to a single, optimized intake path with a larger plenum and long tapered runners. You trade a little bit of the very-low-RPM response most owners never feel on the street for stronger, more consistent flow from the mid-range to the 7,400-RPM redline — exactly where the H22's VTEC top cam earns its reputation.

How Much Horsepower Does the Skunk2 Pro Series Add?

On a stock or lightly modified H22, expect roughly 6 to 8 wheel horsepower from the Skunk2 Pro Series manifold by itself. Skunk2 rates the Pro Series line at up to an 8% increase over stock, with bigger gains on built or forced-induction engines. The honest take: an intake manifold is not a magic bolt-on. By itself on an otherwise-factory car, the gains are modest single digits, and some owners report little change without supporting mods. Where this manifold earns its keep is on a complete combo.

The Pro Series is engineered to add power across a broad band, roughly 3,000 RPM to the top of the tach, with the biggest improvements showing up in the mid-range and high RPM where the H22's VTEC cam profile (engaging around 5,200 RPM) is already working hardest. Stack it with a cold air intake, a header and high-flow exhaust, and a proper tune, and the manifold becomes the piece that lets the rest of the airflow path breathe. A factory H22A4 makes 200 hp at 7,000 RPM; combos built around this manifold routinely push well past that.

Set realistic expectations based on your combo. On a bone-stock H22 with the factory intake, exhaust, and ECU map, the manifold alone is a top-end "wake-up" you feel more than the dyno shows — think a few horsepower and a crisper pull past VTEC. The cars that see real, repeatable gains are the ones with the supporting mods: a full intake-and-header combo will typically clear 210-220 wheel horsepower on a healthy, tuned H22A4, and a higher-compression or stroked build leans even harder on the Pro Series casting's extra flow. If you are chasing every last number, the thick A356 walls let a porting shop open and match the runners to your head — a step most owners never need, but one the design leaves on the table.

Does It Fit Your Prelude? H22A1, H22A4 & F20B

This manifold fits the H22A and F20B engines used in the 1993-2001 Honda Prelude, covering both the 4th-generation (1992-1996, BB1/BB4) VTEC cars and the 5th-generation (1997-2001, BB6) Prelude. This particular Black Series SKU is listed for H22A/F20B applications excluding the Type SH trim, so confirm your exact engine and trim before ordering. Here is how the relevant engines break down:

H22A1 – 1993-1996 Prelude VTEC

The 4th-gen USDM Prelude VTEC ran the 2.2L (2,157cc) DOHC VTEC H22A1, rated at roughly 187-190 hp at 6,800 RPM and 153 lb-ft at 5,500 RPM on 10.0:1 compression. This is the original screamer that made the Prelude a giant-killer.

H22A4 – 1997-2001 Prelude (BB6)

The 5th-gen Prelude got the updated H22A4, rated at 200 hp at 7,000 RPM (some sources list 195 hp) and 156 lb-ft at 5,250 RPM, with a redline around 7,400 RPM. It is the most common platform for this upgrade.

F20B – The JDM Swap Favorite

The F20B is a 2.0L destroke of the H22 from the JDM Accord SiR and Torneo, making around 197-200 PS at 7,200 RPM. Because it shares the H22's head architecture, the Pro Series manifold bolts right on, which is why F20B swap builders love it.

Installation Notes & Tuning

Installation is a true bolt-on for a weekend wrencher, but a few details matter. Budget about 2 to 4 hours. You will reuse the factory throttle body, fuel rail, injectors, and sensors, but you must buy a fresh H22 intake manifold gasket separately — do not reuse the old one. The Pro Series eliminates the EGR circuit, and the H22 kit includes an EGR relocation/blockoff mount to keep things clean.

One critical install tip from our shop: remove the factory brown ceramic fuel-rail spacers. They are not used with this manifold — the rail sits lower, and the mounting holes may need to be slightly elongated. Leaving the spacers in is the number-one cause of loose or leaking injectors after the swap. Finally, while the manifold will run on the stock ECU, a tune is strongly recommended to capture the gains; OBD2 (1997-2001) owners often run a tuned or converted ECU for best results. You do not need larger injectors on a stock or mildly modified engine.

Complete Your H22 Prelude Build

A high-RPM intake manifold deserves a chassis and cooling system that can keep up. These are the in-stock, Prelude-specific parts we pair with the Skunk2 Pro Series for a complete, reliable build. Confirm the fitment year for your generation — some parts are specific to the 92-96 or 97-01 cars.

Is the Skunk2 Pro Series Manifold Worth It?

For an H22-powered Prelude that you actually plan to build, yes — the Skunk2 Pro Series is one of the best dollar-per-result bolt-ons you can buy. At $426.82 it is not the cheapest mod on the list, but it is a permanent, OEM-quality casting that you fit once and never revisit, and it is the foundation the rest of your airflow upgrades plug into. We have seen plenty of Preludes roll through our Tampa shop where owners bolted on an intake and header first, plateaued, and only found the next chunk of power once the restrictive factory dual-stage manifold came off. If your car is dead stock and staying that way, spend your money on tires and maintenance first. If you are building toward a high-RPM, tuned H22 or an F20B swap, buy the manifold early and build around it.

One honest note for shoppers: you will see skeptical threads online from owners who bolted this manifold onto a stock car and felt nothing. They are not wrong — in isolation the gains are small. The Pro Series rewards a complete combo and a tune, and judged that way it consistently earns its place as the go-to H22 intake manifold.