Yeah, you'd better check.. I'd think 40 series on anything would be semi
I had 50 series on my 5.7 and it gave a nice sound but not to much volume..
got a friend who has a set of 30 series on his 5.7 and it's friggen lound..
heard several 5.3's with 40's and sounded great to me..
so if you can't notice any difference something is fishy.
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