You get a resounding YES from me. I ran the hooker glasspacks in mine for about 4 years, the older they get the worse they sound, and that only takes less then a year to happen. The hooker mufflers will rust to the inside of your tubes and they are a royal PITA to get out when that happens. The baffles have 2 small mounting tabs that make contact with the inside of the tubes, the fit on mine was almost snug and when it comes time to change to change them I have no doubt it will be 100 times easier. I’ve only had my 81 back on the road for just over a week and everyone comments on how cool it sounds now, most of them heard it before. I took an older guy for a ride today, all he could do was grin from ear to ear and tell me how much fun he was having, especially when we went sideways. 🙂

As for burning yourself, I haven’t done it yet, you just have to pay attention that’s all, and remember to warn your passengers. Buy the baffles, don’t waste a dime on crummy mufflers.

C3 Shark Tank

Dynojet Research

Rich at Backstreet Performance in Medina, Ohio called me about a problem he was having with a corvette. I stopped up and Rich said the 383 wasn’t getting any real power. I looked in the end of the sidepipe and saw the culprit…reverse flow mufflers. 

A set of STS Baffles would change that. Out with the old (much work), in with the new STS Baffles. The owner wanted more power than DB control, so off came the center tube caps…back to the Dyno.
With Reverse flow:
240.67 RWHP
280.57 RWT

With STS Baffles:
358.38 RWHP
372 RWT

Regained 117.71 RWHP & 91.82 RWT.

Click here to view Dynojet Research sheet
. Provided by members of the C3

“Holy Smokes, side pipe baffles woke up the 533 incher…. Big time. I was running hooker reverse flow muffler inserts, not bad, but very quit. Today got a hold of some baffles, just a little bit louder that the Hooker inserts, but let me tell you, what a sounds. The sound is out of this world. That’s not all, I could idle at 700, but the car would jump all over the place, so I set the idle at 900. These baffles produce no back pressure, adjusted the idle back to 700, and 533 idles just as smooth as my Catera. Wait there’s more. I had a hard time reaching the 5K rev line. The rev’s would climb to 4500, no problem, but after that, it would labor to 5000 and die. Drove me nuts. Adjusted the timing, valve lash, everything, Jim comes along with the baffles, “Here son, try these, and kiss your troubles away”. Okee dokee, let’s give them a shot. Put them on and nailed it, almost lost it, as the revs climbed past 6500 and the car was going sideways, and I hit second, and up to 6500. 

Man, talk about a perpetual grin on your face. 

Gonna wash da car and go looking fer a Viper tonight.

Hey, Jim, fantastic work on the Baffles, mucho thanks for the ever lasting grin.” G.Daina

”WOW is the word or to quote G.DAINA-HOLY SMOKES. It feels like a different motor, the horsepower and torque difference is something you can really feel, all the way though the RPM range. Right off of idle I could feel it, the more gas I gave it the more it wanted. The horsepower and torque gains were more then I expected and the sound is unbeatable. This is what Hooker Sidepipes should sound like, louder then the reverse flow mufflers, but no were near as loud as the CCI inserts. My thanks to Jim for making a great looking exhaust system work as good as it looks. 
Thanks again Jim.” 1RED1


Just got my new baffles for my Hooker side pipes and installed them this afternoon. Very nice design and quality piece of equipment! The mufflers are by no means quiet behind my factory spec L88; but, the car is much easier to drive, idles better, throttle is much more responsive making my double clutches a breeze. The car really and truly sounds the way it was meant to be. Higher rpm’s sound is very authoritative, but smooth.
Chuck H.

Unbelievable. What a difference. The car literally “woke” up. When I saw the mufflers that came out of the car I was shocked. They were basically a 1 and 1/4 inch pipe that was wrapped by a bigger diameter pipe that was sealed and very restrictive. The money was well worth it. My mechanic said that if he could get a gain like that for the 650 I paid by time everything was converted to Canadian money, he would out those on every car. Great job in the design of the baffles.
Mike Nowak, 1bad69

I never realized how much power and performance was being robbed by the stock baffles. And the best part is the sound. I drilled a 5/16″ hole as a starting point and the result is a perfect rumble at idle, even tone at cruise and an all out assault when opened up! Great product and I would recommend them to anyone with side mount hookers… Thanks Jim, first class customer service.

Dear JCL, Holy F~*#in Horsepower! It was nice to get rid of those nine year old glass packs. The STS Baffles are the right thing for side pipes. The sound is perfect and at full acceleration the front end of my Vette wanted to jump off the pavement. The power difference is definitely noticeable. Thank you for the great product. Making noise….

Just wanted to let you know the baffles sound GREAT! They quieted the Saleen down just enough so my wife likes it but still loud enough so people turn their heads before I arrive. Great sound. Thanks for making the Mustang the best sounding around metro Atlanta. Yea, they sound great on Fords.
David A.

The exhaust you sent meets the criteria required by my dogs and wife. Yes the system does seem to pull the exhaust out of the engine………….I really believe it helped the bottom end………….Even our neighbor has made a comment about the different sound. thanks you
Big Block in Fairborn

Hi Jim…Well the new mufflers are on and my father is acting like a kid. He says the car sounds completely different and now has that all important muscle car sound that we all like. Thank you for your warm and friendly help and advice and I can’t wait to tell others about your product.

I bought a pair for my ZZ/502 1979 ‘vette. They work GREAT, and sound GREAT. Also, there was a large hp gain over the Hooker glasspack inserts. The guy’s forum name is JCL.



Last year I ran a best of 13.50 at 103.50 mph….. but with only the addition of the STS Baffles, the mph went from 103.50 to 105.50 consistently. I am definitely making more HP. The motor is running as it was supposed to. Thanks for coming across with a quality product that was needed. UPDATE: A new best of 13.04 at 107.15mph I can smell a 12.99 but it was not to happen. Your baffle inserts have unleashed so much power, I busted a U-joint! My best mph is now 107.15 from a best of 103.5 with the Hooker mufflers. No other changes to the motor, just the baffle inserts.
Charles Kwas

JCL, I was extremely disappointed with my Hooker Reverse Flow Mufflers. They sounded horrible, and seemed to choke the motor from achieving its true performance potential. After receiving my Baffles I wanted to write and thank you for making such a quality product. I was truly impressed with the workmanship. After installing your STS baffles, I was completely amazed. It sounded like it was supposed to, and the motor came alive. My 383 feel like a completely different motor. Thank you for taking the time to answer my questions, help me out. It’s rare that you find a vendor so willing to help and offering such quality products at competitive prices. Best wishes always.
Provided by members of the C3

I have a 71 BB vert and yes headers make a diff. they are hooker 4 to 1 and side pipes. the inside stays cooler, the floor does not get anywhere near as hot. I bought a set of spiral inserts from a forum member and the fit and finish was great. you can feel the diff in the seat of the pants. a lot of times you can make a mod like a K&N air filter that makes more hp but you can’t feel it with headers and the right inserts you can deff tell.
Robert Kirk

Yes they are worth it…. No you will only burn yourself ONCE as all of us with them have. I gained ~~30 HP by going from glasspacks inserts to the JCLs. This is seat of the pants feel…
Clink 69

JCL – After having Hooker sidepipes with glasspack mufflers for over 3 and a half years, I was not very pleased with the performance or the sound of them. I came across the Spiral Turbo Baffles on and decided to check out their web site. The baffles received excellent reviews from people using them, so I decided I would try them after several emails back and forth with Jim (JCL). I installed a 383 into my 1981 Corvette that was previously in a ’67 Corvette owned by a friend, when I started the car I knew I made a good choice putting the baffles in. The sound is absolutely incredible, the car finally sounds like it has sidepipes and draws a crowd wherever I go. Even the previous owner of the motor commented how much nicer they sound then with his factory sidepipes, and when he drove the car he also commented that the motor even performed better
Provided by members of the C3

I can’t say enough about how happy I am with the sound and performance increase.

Hi, I finished my Vette yesterday and finally got to hear it with the baffles on it. They sound great!!! They are actually quieter than my factory side exhaust was! I like the tone much better than the old pipes, they just never sounded quite right before. I can’t wait to hear it with the 502 that’s going in later this year! Thanks for a really cool product! I’m glad Hooker told me about your baffles before I installed their mufflers.

Hey JCL…installed your turbos and am very happy with both sound and performance. Good Job! Thank you.” Tom Gordon, Key West, FL”Jim, baffles were installed today. Sounds great! You might want to send a card to the shop that is doing the resto on my ’72. They were pretty impressed with the sound. Mid Cities Classics in Hurst, TX. The owner is Jim Welch, working on vettes for over 20 years. (817) 685-9433 S. Pipline Rd., Ste A, Hurst, TX 76053.
Robert Chancwds

Baffles on my Cobra
“Finally got the baffles installed on my car last week. Do they sound better than the stock mufflers from BDR? Heck yes–they get rid of that wuss glasspack sound.”
Bill S.

I had the Hooker side mount exhaust with the Hooker mufflers in them, looked great but sounded like a Toyota……….so I installed the new Spiral Turbo Baffles from you and did not drill out the center end cap at all. Installation was simple, and the minute we fired the Vette up we knew this was it!!!! The sound was awesome. It really woke up the Vette………….no dyno needed. The car had way more power than it ever had before. I can’t wait to get a set of these in one of my 442’s!! Thanks for your help and Great products.
Derrick H.