Spintech mufflers: something worth investigating

[Hohn]

OK, I've decided that I could probably use an exhaust upgrade of some sort. Now, I'm generally the kind of guy that likes a newer, better way to do things if it's proven, in fact, to be better. Is there a better exhaust option out there?



In the mid-to late 90s, there was a revolution in NASCAR exhausts. They went to oval pipes (for ground clearance), innovative new X-pipes, and a new muffler design that changed exhaust note and offered almost NO RESTRICTION.



As most of you know, racing organizations are increasingly requiring mufflers to be fitted to the race cars, and many sanctioning orgs (or track policies) even dictate a max dB value that you have to stay under.



Now keep in mind how competitive many of these race classes are. In many drag racing classes, just a couple hundreths of a second can separate #1 qualifier from being on the trailer. In NASCAR, teams will kill for another 5-6hp.



So, lest we in the diesel game be left behind, I'd like to present for our consideration the SpinTech racing muffler:

#ad






They tend to have a different, boxy shape-- like this:

#ad






I looked at this option because these mufflers flow a LOT while really muffling the lowest tones that cause DRONE. I want a LOUD system with NO DRONE! These mufflers look like the hot ticket to that particular goal.



They do change the sound of the exhaust, to make it quite distinctive. Just like a Flowmaster has a unique sound, so do these. Here's a link to hot-rods with these mufflers, and you can hear how the sound is VERY hp, but not super loud. I love it. I personally think it's the best hot-rod exhaust note I've ever heard.



http://www.spintechmufflers.com/spintech/sounds/4spintech.wmv



Now I've never heard them on a diesel, but I'm more than willing to take a gamble on these. I'm working on the money for Rip's 4" straightpipe, then installing one of these mufflers.



Oh, and if you want to install one on YOUR 4" diesel system, the P/N you need is 5661D (the d for diesel).



Justin

 

[Straight6Jeff]

I had a spin tech on my v-10 dodge a few years ago. It was great. The v-10 had an odd on-centers distance for the inlets, and I used a 4" tailpipe. The guys at spin tech welded up the inlets and outlet to my specs... at no additional cost! Customer service was top notch.

 

[KevinLewis]

Those are the hot ticket for sprint cars out here. I wonder what makes a diesel specific muffler?

 

[Hohn]

Those are the hot ticket for sprint cars out here. I wonder what makes a diesel specific muffler?

I dunno. I think it's just a street muffler with much higher flow.



All their other mufflers that have 4" or 5" in/out are pure race mufflers, and pretty loud.



Since we want a little more muffling, it's probably not best to just go with a 4" race muffler.

 

[ProMac1K]

I know a good amount of Chevrolet enthusiasts (i. e. drag racers) that run those and love them. Yes, they do have a very distinctive tin-ny sound to them.

 

[Tcolesanti]

I have a set of these on a 402ci BB Ford FE and I have to admit they are the best sounding muffler out there. I have two 3. 5" in/out's on it and its pretty dern loud.

 

[ProMac1K]

I have to wonder if you'll get the full effect of the sound with a diesel engine. The exhaust isn't as aggressive on a diesel I don't think. Remember the saying, the turbocharger counts as a muffling device. Well think of it as that. Changing out mufflers won't give as much effect on a diesel as it would on a gas. Sounds stupid, but I have to wonder if modifying your intake would change the sound more than changing out mufflers. Not necessarily the exhaust sound (of course), but you get my drift. That's why companies don't market several different mufflers for diesels (like FM 30/FM30 Delta/FM40/FM40 Delta/FM50/FM 50 Delta/American Thunder/etc like Flowmaster advertises which is generally for gas engines).



Let the flaming begin!

 

[Hohn]

NO flames-- I'd agree. I wouldn't mind if it sounded like stock, even-- as long as the flow is there.



I like the fact that these mufflers seem to shift the exhaust note to higher frequencies. My theory is that it would reduce bark and drone, but give me more bite and turbo whistle in the pipe, like a 6. 0. The 6. 0psd is crap, but when straightpiped, they are one of the best sounds I've ever heard.



I agree that we don't need to worry about pressure pulse tuning and such like the gassers do, but if these give a good sounds, no drone, and high flow, they will please me very much.



IMO, a turbodiesel muffler doesn't need any unique design characteristics relative to a gasser muffler. Maybe optimizing it to muffle lower frequencies would help, as diesels tend to have more bark and lower freqs.



jmo, no flames intended.

 

[ProMac1K]

That's exactly what I was thinking. Pretty much common sense thinking if you're familiar with both engines.

 

[Devan Manis]

i agree with both of you but tell me this. how come it sounds like the third gen's are so much louder straight piped than a straight piped 2nd gen? the third gens have a louder "bark" to them.

 

[ProMac1K]

Third gens have a much different exhaust tone. They also have a much different injection system.

 

[Hohn]

i agree with both of you but tell me this. how come it sounds like the third gen's are so much louder straight piped than a straight piped 2nd gen? the third gens have a louder "bark" to them.

3rd gen's have other design qualities that change the note. Factory 4" exhaust is one thing. Higher Compression ratio is another (IIRC, it's 17. 2:1 while a 2nd gen ETC is 16. 4:1 and ETH is 17:1 even). I think the cam timing is a little more retarded as well, which would have a huge effect on exhaust note and probably helps spoolup as well a reduce emissions.



jmo

 

[Devan Manis]

Thank you Hohn, and it makes sense to me.

 

[rbattelle]

Wow, I really like the sound of those mufflers. As you guys point out, it's very loud but not in a frequency range that's painful. I'd be very curious to see what the diesel one sounds like!



-Ryan

 

[24V-DSL]

Hohn...



Where did you get the PN 5661D? I've looked at every offering on their site and that number isn't listed. I'd like to see a pic and dimensions.



thanks.