# Fi EXHAUST Pro vs 034SPI

The clearest difference is rating: 034SPI at 4.2 against Fi EXHAUST Pro's 3.7. 034SPI also leads on ratings volume (43 vs 3). Fi EXHAUST Pro's advantage is iOS requirement (12.0 vs 15.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

034SPI holds the better App Store score, 4.2 against 3.7. That said, the two scores are not equally well evidenced: 034SPI has 43 ratings behind it against 3, so its average is the more settled of the two.

Fi EXHAUST Pro ships an update monthly, 034SPI every 2 weeks. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Fi EXHAUST Pro | 034SPI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/fi-exhaust-pro/id1515653352/reviews) | **[4.2 (43 ratings)](https://appshunter.io/ios/app/034spi/id6468930588/reviews)** |
| Number of ratings | 3 | **43** |
| Positive reviews | — | 55.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 39 MB | 126 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Frequency Intelligent Exhaust Co. LTD](https://appshunter.io/developer/1191737344) | [034Motorsport](https://appshunter.io/developer/1699254218) |

## What reviewers say

### Fi EXHAUST Pro

[App page](https://appshunter.io/ios/app/fi-exhaust-pro/id1515653352)

Control and customize your car's exhaust valve system with this app. Adjust valve settings based on RPM, speed, or turbo boost, or manually control them. It also offers a one-click function to clear diagnostic trouble codes from your car's ECU.

**Highlights:** Bluetooth exhaust valve control, Automatic valve modes (RPM, Speed, Turbo), Manual valve operation, Customizable remote buttons, One-click ECU diagnostic code removal, Smart interface remembers settings

**Features:** macOS Compatibility

**In-app purchases:** none


### 034SPI

[App page](https://appshunter.io/ios/app/034spi/id6468930588)

This app allows users to flash their car's ECU/TCU tunes, configure live data displays, and record data logs for analysis. It also provides diagnostic support tools like reading and clearing DTC codes.

**Highlights:** Flash ECU/TCU tunes, Configure live data displays, High-speed data logging, Upload logs to server, Read and clear DTCs, View emissions monitor status

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Fi EXHAUST Pro free?

Fi EXHAUST Pro is free to download, with no in-app purchases.

### Is 034SPI free?

034SPI is free to download, with no in-app purchases.

### Which has better reviews, Fi EXHAUST Pro or 034SPI?

034SPI is rated higher. Fi EXHAUST Pro averages 3.7 out of 5 from 3 ratings, while 034SPI averages 4.2 from 43 ratings.

### Do Fi EXHAUST Pro or 034SPI have ads?

Neither Fi EXHAUST Pro nor 034SPI shows ads.

### Which is updated more often, Fi EXHAUST Pro or 034SPI?

Fi EXHAUST Pro ships an update monthly, and 034SPI every 2 weeks. Most recently, Fi EXHAUST Pro was updated on November 3, 2026 and 034SPI on November 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*