Just my opinion here...I think glasspacks sound good on stock engines or very mildly modified ones...you start building a hot motor though and they are just way too loud. Smaller engines like 305's with a mild cam in them sound real nice with glasspacks without being overly loud. Good glass packs dont hurt power as much as many people think...car craft did a shootout of under $50 mufflers a few years ago and the thrush glasspacks were better than several of the supposedly hi-po turbo mufflers. Now, using an el cheapo muffler shop made in taiwan glasspack is a different story...most of those only have 1 3/4" or 2" cores...the shop just expands the nipples to make it fit whatever pipe size is needed.
375hp 78 Chevy truck
77 Chevy Nova
95 Chevy Lumina 3.4L
and building a 78 Nova
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