Reviewed By Barry B (Mountain View, CA) Reviewed for a 2001 BMW Z3 —1/21/2015 8:06 PM
Flowmaster describes this "mild". This easily sets off car alarms with excruciating low frequency resonance when stepping on the gas at midrange RPMs.
Reviewed By paul o (LAS VEGAS, NV) Reviewed for a 2012 Chevy Impala —1/21/2015 1:45 AM
I bought the s40's thinking that it was near the lowest #= deepest sound as higher the model number the quieter it is, however 40 then 44 the 10 in order. I took off the resonator on my 2012 chevy impala and it sounds like a v8, with Injenr X-1017-BB - EA Nanofiber Dry Air Filter /or K&N (oil based cotton,, this thing growls an flow mor air. I do get a power kick out of it and not to obnoxious unless im "getting on it"! super40 with resonator sounded almost like stock,for me this is Grrreat!