I've got the same engine & the same setup, and I've removed those bits & thrown them away !!
They're just resonators, which quieten the intake noise to make it more comfortable to drive. I dont see that they'd help performance at all [altho I could be wrong] so maybe the lack of pull was just the engine sucking in hot air form the engine bay, rather than colder air from the intake feed ?
I'm also gonna get round this problem in the next few months, but havent quite finalised the details yet
More when I've got something to show u guys !
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