Sidepipe Spiral baffles
Le Mans Master
Joined: Jan 2004
Posts: 8,295
Likes: 30
From: one night in Bangkok you are never lonely
There is a slight "echo" or "ping" sound at idle. I can hear it in mine when the cam lopes. Only at idle though.
No, they are not loose-it is not a rattle. The design creates a ping sound at idle. Only noticable if you listen for it.
They sound their best at higher RPM.
I will say they breath very well.
No, they are not loose-it is not a rattle. The design creates a ping sound at idle. Only noticable if you listen for it.
They sound their best at higher RPM.
I will say they breath very well.
Drifting
Joined: Jan 2008
Posts: 1,962
Likes: 5
From: Schererville IN
I was concerned they would be too loud if drilled and also not provide enough back pressure. I'm only about 350-400 HP, so from what I've read on here and on the STS website, there was no real need to drill in my HP range. They flow real well as is.
What's the diameter of the center tube/plug? 7/8? maybe 1 inch? I already went from 2 1/4 pipe to a 4 inch side pipe minus the center plug, so probably a good 3 inch flow.
Drilling the center will definately make them louder, as you're opening a straight through tube, but I did not want to go deaf. With the plugs in place, I can still hear the radio fine and have a conversation in the cockpit. Also don't have the droan and resonation that I had with the Flowmasters.
I had true dual 2 1/4 inch out the rear with Flowmaster 2 chamber and high flow cats before and these spirals are quieter than the old system.
I'm happy with it.
If I could change anything it would be to have a more throaty, muffled, deep idle. If you want the perfect sound at idle, more backpressure with the possibility of burning out every couple years, go with the Hooker inserts. If you want a decent sound at idle and a throaty roar on acceleration and cruise, with great flow, and no chance of rotting out, go with the spiral baffles! They are nice heavy quality. Galvanized Steel. They fit snug. Welds are nice. Hardware is good stainless.
Only installation snafu I had was one of the mounting bolts for the STS inserts lined up exactly with one of the Steelshield clamps. But only on one side??? Must have been my layout? Other side fit fine.
Last edited by blckslvr79; Jun 13, 2008 at 10:52 PM.
Safety Car
Joined: Nov 2006
Posts: 4,449
Likes: 0
I love my sweet thunder inserts, they arent loud enough to make any neighbors mad, but if I havent stomped on it for a whyle, it will still supprise me (and sometimes startel me) when I mash it
I looked at the STB but it was a bit outta my price range for the time when I was buying
Miles
I looked at the STB but it was a bit outta my price range for the time when I was buying
Miles
Le Mans Master
Joined: Jan 2004
Posts: 8,295
Likes: 30
From: one night in Bangkok you are never lonely
No. I left the center plug in place as it was delivered.
I was concerned they would be too loud if drilled and also not provide enough back pressure. I'm only about 350-400 HP, so from what I've read on here and on the STS website, there was no real need to drill in my HP range. They flow real well as is.
What's the diameter of the center tube/plug? 7/8? maybe 1 inch? I already went from 2 1/4 pipe to a 4 inch side pipe minus the center plug, so probably a good 3 inch flow.
Drilling the center will definately make them louder, as you're opening a straight through tube, but I did not want to go deaf. With the plugs in place, I can still hear the radio fine and have a conversation in the cockpit. Also don't have the droan and resonation that I had with the Flowmasters.
I had true dual 2 1/4 inch out the rear with Flowmaster 2 chamber and high flow cats before and these spirals are quieter than the old system.
I'm happy with it.
If I could change anything it would be to have a more throaty, muffled, deep idle. If you want the perfect sound at idle, more backpressure with the possibility of burning out every couple years, go with the Hooker inserts. If you want a decent sound at idle and a throaty roar on acceleration and cruise, with great flow, and no chance of rotting out, go with the spiral baffles! They are nice heavy quality. Galvanized Steel. They fit snug. Welds are nice. Hardware is good stainless.
Only installation snafu I had was one of the mounting bolts for the STS inserts lined up exactly with one of the Steelshield clamps. But only on one side??? Must have been my layout? Other side fit fine.
I was concerned they would be too loud if drilled and also not provide enough back pressure. I'm only about 350-400 HP, so from what I've read on here and on the STS website, there was no real need to drill in my HP range. They flow real well as is.
What's the diameter of the center tube/plug? 7/8? maybe 1 inch? I already went from 2 1/4 pipe to a 4 inch side pipe minus the center plug, so probably a good 3 inch flow.
Drilling the center will definately make them louder, as you're opening a straight through tube, but I did not want to go deaf. With the plugs in place, I can still hear the radio fine and have a conversation in the cockpit. Also don't have the droan and resonation that I had with the Flowmasters.
I had true dual 2 1/4 inch out the rear with Flowmaster 2 chamber and high flow cats before and these spirals are quieter than the old system.
I'm happy with it.
If I could change anything it would be to have a more throaty, muffled, deep idle. If you want the perfect sound at idle, more backpressure with the possibility of burning out every couple years, go with the Hooker inserts. If you want a decent sound at idle and a throaty roar on acceleration and cruise, with great flow, and no chance of rotting out, go with the spiral baffles! They are nice heavy quality. Galvanized Steel. They fit snug. Welds are nice. Hardware is good stainless.
Only installation snafu I had was one of the mounting bolts for the STS inserts lined up exactly with one of the Steelshield clamps. But only on one side??? Must have been my layout? Other side fit fine.
