BCP Stumble Mod 2008+ STI

Marsoni

M251S

$162.50

Get it in 3 business days with 1 day shipping. Friday, May 29

BCP Stumble Mod 2008+ STITune Safely and Properly! The BCP Fuel Stumble Mod is a critical part of tuning your car safely and properly. We suggest this on all stage 1 2 cars and REQUIRE it on anything more. What is the stumble mod, and WHY do I need it? The strange design of the factory fuel pressure regulator system causes an abrupt and obvious stumble or hesitation around 3,000 3,500 rpm at many different throttle positions on the 2008+ STI. This is mainly caused by

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If I could give zero stars, I would. Do not purchase if you intend to use the Access Code. I was very careful to scratch off the Access code, but you can see it was still unreadable. I went to the website and submitted a ticket. One option for a reason to submit a ticket is 'unreadable access code", so they know this is a problem. They ask for a photo of the code and a receipt of purchase. I sent both. Then they asked for proof that the book was purchased NEW. This was not noted on the Amazon invoice. I was instructed to reach out to the vendor for the additional info. Or I could spend more money on another access code. There are other study options available.

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Reviewed in the United States on February 20, 2026

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Amazon Customer

Port Orchard, US

★★★★★ 5

Great study book

Format: Paperback

Questions are very similar to my current program questions and have great rationales.

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Reviewed in the United States on November 18, 2025

Verified Purchase