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With the resonated FI CBE, I had a slight drone at 2.2K RPM. After adding the HKS LDPs, the drone was gone...as much as I could tell with my poor hearing, anyway.
I have same CBE and non res FI LDPS and zero drone. Each of these cars are different.
 

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Well I bought the spot in line from someone else who started months earlier but since sold his Q50. But even then its been like 4 months total. Mine was delayed because they closed the shop for 2 weeks recently for COVID.
 

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Discussion Starter · #24 ·
You'll be fine with the 2.5" diameter LDPs considering you're not planning major upgrades upstream, such as bigger turbos, higher-flow injectors, etc. The 2.5" LDPs will not be a choke-point in establishing the most gains from your planned bolt-ons.
How much hp/ torque did you get from AMS LDP and FI cbe?
 

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How much hp/ torque did you get from AMS LDP and FI cbe?
I ordered than installed the FI LDP & FI resonated CBE at the same time. Never dyno'd it, but this will give you an idea of how they performed:

 
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