FLOWMASTERS!! Are there 3 kinds of 40 series 2 chambers??
 

I installed 2 chamber 40 series flowmasters. And the car sounds way to load inside the car especially when I get to 2000 RPM's. I dont know if Im correct but are there 3 kinds of 40 series? My friend has 2 chamber also with a H-pipe and his sounds nicer and alot lower.

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89 Police Interceptor
BBK Shorty Headers, K@N Cone Filter,H-pipe no cats, 2 chamber FlowMasters,Under Drive Pullys,14 degree Timing, Short Belt, No Air Silencer, oil cooler, 3.08's, And All Police Package goodies

Same h-pipe or is it different? That might have something to do with the interior resonance? As far as I know there is only one j=kind of 40 series 2 chamber mufflers, unless they have a regular and delta flow version?

Nope Just the same H-pipe, but damm that thing is to laod at 2000 rpm's. is there a way to block that resonance even a little bit? does the sound come from mostly the back seats and the trunk area?

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89 Police Interceptor
BBK Shorty Headers, K@N Cone Filter,H-pipe no cats, 2 chamber FlowMasters,Under Drive Pullys,14 degree Timing, Short Belt, No Air Silencer, oil cooler, 3.08's, And All Police Package goodies

Easy resolution...get Mac Flowpaths, and you'll never look back. I have both, and I can't wait till I finish the body and paint on my coupe so I could put the whole Mac system on that one too!! (Avoiding overspray!)

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1992 5.0 LX, Edelbrock 6037 Heads, Cobra Intake,E-303, 1.6 Rollers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP w/ 24 lb injectors,BBK equal length shorties,offroad h-pipe,Mac Flowpath Cat-Back, Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors

Daily driver: 89 notch with 200K plus, BBK shorties,offroad,2-chamber flowmasters with dumps, cut and welded stock shifter...and it runs like a champ.

There are two types of 40 Series (2-chamber): Standard and Delta Flow. The Deltas are Flowmaster's "new and improved" design. The scavenge exhaust gases a little better than the old style, so there's a little more torque. The biggest difference, however, is that the Delta Flow's have about 30% less interior resonance than the old style.

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Moxie Racing

The one's I have are delta's. My friend has 2 chamber flowmasters and they are not delta's but they sound better than mine. what's up with that?

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89 Police Interceptor
BBK Shorty Headers, K@N Cone Filter,H-pipe no cats, 2 chamber FlowMasters,Under Drive Pullys,14 degree Timing, Short Belt, No Air Silencer, oil cooler, 3.08's, And All Police Package goodies

Then thats the difference. the delta's have the additonal baffling behind the primary wedge in chamber. I suspect that they improve flow by reduxcing turbulence but the additoinal baffles also change the way the muffler resonates (much like the way you change the the notes on a musical instrument). Course my theory on that is if it makes more power whats the problem. My bro used my old Dr. Gas-X crossover and some of the local yokels joked him about it. To bad for them that it pumped up his mid-range a huge amount compared to the dual system he had before. It took a bit of getting used to but I prefer the sound more and liked the power improvement even better

Yeah I gues I gotta get used to it but someday I will get rid of them. I like the power but not that load inside the car.

well its 2 late to tell you 2 get MAC but a word of advise on your trip up here..crank the radio..your car at 2,000rpms in fith gear for hours at a time will put you to sleep..i gaurentee it..i dont know why but i was told that deep constant sounds like that do that to you and belive me its true

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1987 black notch(ex 4 banger)
DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..

Yeah I know, even here in city driving makes me go to sleep, But thats mostly because of the stupid drivers here and bad traffic. HEHEHE

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89 Police Interceptor
BBK Shorty Headers, K@N Cone Filter,H-pipe no cats, 2 chamber FlowMasters,Under Drive Pullys,14 degree Timing, Short Belt, No Air Silencer, oil cooler, 3.08's, And All Police Package goodies