[78w72]

Originally Posted by Lee

I have the RacePros on one car (Cutlass) with first a 320rwhp 455 Olds, and now with a 400rwhp 6.0 LS. They sound pretty much the same with either motor.

thats fine, everyone has their own opinion & perception on things like this. but most guys will agree when it comes to mufflers, the engine combo & rest of the exhaust system make a huge difference in the sound of the muffler. a 320 hp olds vs a 400 LS would likely sound quite a bit different, different headers, cam, compression, bore/stroke etc between the 2 engines.

also i recall you recently saying how much you hate the race pros, even described them as "raspy" or glass pack sounding.... i have never heard them described that way nor do mine or any others ive heard sound anything remotely close to glass packs. must be a case of the engine/exhaust system differences & personal preference.

& the borlas probably have some internal differences in the packing etc, they are almost 2x the price of race pros... & the engine/car difference is a big factor here, your firebird with borlas has a low compression stock iron head 285hp 455 vs a 400hp LS on the race pros... of course they will not sound anywhere near the same & comparing the 2 is apples to watermelons. but im glad you like them & im sure they are a good muffler.

[Lee]

Originally Posted by 78w72

thats fine, everyone has their own opinion & perception on things like this. but most guys will agree when it comes to mufflers, the engine combo & rest of the exhaust system make a huge difference in the sound of the muffler. a 320 hp olds vs a 400 LS would likely sound quite a bit different, different headers, cam, compression, bore/stroke etc between the 2 engines.

also i recall you recently saying how much you hate the race pros, even described them as "raspy" or glass pack sounding.... i have never heard them described that way nor do mine or any others ive heard sound anything remotely close to glass packs. must be a case of the engine/exhaust system differences & personal preference.

& the borlas probably have some internal differences in the packing etc, they are almost 2x the price of race pros... & the engine/car difference is a big factor here, your firebird with borlas has a low compression stock iron head 285hp 455 vs a 400hp LS on the race pros... of course they will not sound anywhere near the same & comparing the 2 is apples to watermelons. but im glad you like them & im sure they are a good muffler.

Summit prices on 3" polished case RacePros and ProXS

Pypes MVR-16S $95.97 https://www.summitracing.com/int/par...r16s/overview/

Borla ProXS 40359 $96.99 https://www.summitracing.com/int/parts/bor-40359

Barely a $2 difference.

Flowmasters SOUND like Flowmasters, whether on a stock 302 or a wild big block. The cadence of the exhaust will change of course, but the overall "sound" will still be quite similar. I had Flowmasters on the Cutlass when it still had the 455 Olds, and it sounded VERY much like the 455 Pontiac in my T/A clone when it had the Flowmasters (before installing the new exhaust/Borlas).

I had the large case Georlichs on my low-11 469" '67 Firebird, and another set on my 427" SBF wagon - there was a different lope to the exhaust, but the overall sound while cruising or at WOT was pretty much the same.

[78w72]

Originally Posted by Lee

Summit prices on 3" polished case RacePros and ProXS

Pypes MVR-16S $95.97 https://www.summitracing.com/int/par...r16s/overview/

Borla ProXS 40359 $96.99 https://www.summitracing.com/int/parts/bor-40359

Barely a $2 difference.

Flowmasters SOUND like Flowmasters, whether on a stock 302 or a wild big block. The cadence of the exhaust will change of course, but the overall "sound" will still be quite similar. I had Flowmasters on the Cutlass when it still had the 455 Olds, and it sounded VERY much like the 455 Pontiac in my T/A clone when it had the Flowmasters (before installing the new exhaust/Borlas).

I had the large case Georlichs on my low-11 469" '67 Firebird, and another set on my 427" SBF wagon - there was a different lope to the exhaust, but the overall sound while cruising or at WOT was pretty much the same.

sorry i saw a $100+ price on borlas vs about $60 for RP's, didnt look at or compare polished. but the borlas & others may have slight differences in internal design to change the sound a bit, i still feel the straight throughs are similar sounding on a similar engine/car in my experience.

my reply was to you saying your borlas dont sound similar to race pros, yet the borlas are on a totally different engine/car than the RP's, so it wasnt a fair or equal comparison.

as long as you like them on your car is all that matters for you. some, including myself like the race pros & ultraflos, but on a different car they might not like one or the other. all comes down to the application they are used on & personal preference.