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Most assuredly. All Moto Guzzi motorcycles run excessively lean in stock configuration as a result of the E5 standards and other worldwide regulations against emissions.
If you realize this then you will understand that if you do all of those modifications to your motorcycle, I assure you 100% that it will be running catastrophically lean.
You will need a solid fueling solution to put the motorcycle into proper air/fuel ratios.
I would highly recommend that you check the fueling options for your motorcycle in the STORE.
You’re new here, so question, did you read this thread from the start? I have dyno’ed and fuel corrected almost every combo on the market, including our own (GTM). You’re posting on a site that links to our sister site using the STORE tab above. Sales support this site you are here asking for (free) information on. You’ll not get my opinion, rather facts that I live in as a Guzzi-focused business owner. While we are both a Zard and Mistral dealer, you’ll see what we sell and endorse there.
Manifold is generally an intake term here, headers better define them. The E5 model runs insanely lean and has catalytic converters in the headers. The fueling MUST be corrected.
Mistral leaves a ~5 hp deficit to our GTM header & Y set. Links on the first post here.
