a little while ago i was suggested by a forum member to try these header inserts from summit racing (sorry i cant remember your name now). i do remember you wondering how they would sound on a rotary.

well since the snow finally went away today, i decided to drop mine in. first impression (at idle) not much of a noise difference. however once i got it out on the road these things do work out pretty damn well for the price. this quieted my exhaust note down to a more grunty, throaty sound more-so than the multiple mufflers, cats, resonators i have tried.

i was also impressed by summits service, they sent me a giant catalog, free hat, a bunch of stickers and a sample of some new pit stick. haha

to sum it up. yes for the price this will quiet down your exhaust about the same as adding a entire new muffler and for half the price. so for you people out there with straight pipes to a single muffler you may want to consider this. i have spent far too many hours messing around trying to get my car quiet and so far this has been the most noticable difference.

you can find them on the website here :

http://store.summitracing.com/partde...5&autoview=sku

two thumbs up!

 

Yea, I've ordered a bunch of stuff from Summit over the past few months and they are great. A great web site, and great service. You probably don't get stuff in Canada this fast, but I always get stuff in 2 - 3 days.

Rich

 

They quiet the exhaust down but at what cost? They look restrictive enough to kill many of the gains you get from having a header and high-flow exhaust system.

Jon

 

What temperature will it go up to. I could see it melting in less than a year. just my .02

 

there is absolutely no way this is as restrictive as many chambered muffler systems, i can feel a bit of a loss of low-end torque but the high-end seems to be better and as for melting.. not likely. its just as thick as exhaust piping.

however, time will tell.

 

Well, its been a while. What's time going to tell us? This is an interesting idea that sounds like it *might* work, but have they melted or failed yet?

EDIT: They also seem pretty cheese gratery

 

Yes please do tell!

 

haha, well it hasnt melted or anything as thought of before. i actually removed it about a week ago just to see if there would be much of a performance gain, i guess a little bit but the noise was yet again unbareable for daily driving.

it is rattling around a bit during idle since i didnt weld it in, but next time i have access to a welder thats an easy fix.

i still highly suggest this as it does infact really tone down the exhaust note.

 

How are the holes drilled? They looked like a cheese grater in the pictures and I'm wondering how much that kills the flow.

I'm thinking of grabbing one when I put together my exhaust, except placing it between a presilencer and a muffler.

 

When I had a Harley back in the 70's with straight pipes, the trick to quieting them down was to take a 1/4" steel rod and weld a series of washers on it, stick it in the pipe, then tack weld it. As ghetto as it sounds, this was a very effective noise suppresion device.

Problem was, I kept blowing them out and leaving them on the street somewhere. This device looks to be a better engineered and more scientific way of doing it. If my new 3" exhaust is too loud, this will probably work.

 

Whenever I order anything from summit I always end up impressed! The products seem to be excellent, and they come pretty fast even for me being in Canada. A+++ for them!

 

Looks like summer is in the air already, everyone getting down to work, Anyhow on the topic of quieting down our beast i have come up with an idea that I've been using for about a week now.I have SDJ headers, 2.5" piping to a magnaflow single in dual out. Me dual outputs are 2.5" now anyone that has run a similar setup can tell you how loud this thing can get. Since i got a ticket a couple of week ago about excesive noise (110$ worth had 3 cruisers waiting at my house for me) so i came up by doing down sized tips, that can be bolted on and unbolted, The tips consist of 1 1/16" sized pipes that are 4" long, sheet metal cut into a circle of 2.5" and has a hole in there with 1 1/16". I first welded the small pipe to the inside circlewith 2" sticking out and 2" going inwards. then i welded the hole thing to extra piping that I had cut into 5"long. The result is about 1/3 of the noise if not less ... but restrictive, I can still shift up to about 4500rpm ... but anything above that seems like pushing it too hard. Having these on has also helped me with my heavy foot problem, i used to average about 12 miles to the gallon, now i'm getting about 18 miles to the gallon.

 

I agree with the loud factor. For daily driving and highway cruis'n rotarys are just to damn loud IMO. I just have the cats removed running through a new factory muffler. And it is still to loud.

Why not go this route? I did it on my buick powered FC and it's the only way to go If you daily drive your "race car" IMO. Or just want the sleeper effect like I do.

I have a full 2.5" exhaust system with turbo mufler (1 chamber resonator) at the end. Also I have a silencer behind the muffler. Down by the headers I have a Y pipe. and electric exhaust cutout installed. This way I can un cork the exhaust from in the car anytime. And it is quiet as a caddy on the cruises to work... Or when I want to have the stereo on, cops are around...etc....

http://www.buickgn.com/electricexhaustcutout.htm

Lots of other brands make these. QTP is the cheapest I believe.

When I order up my header, I'll order a cutout for my FB too and post pics....

Just a suggestion

Good luck!

 

cutout would be a great solution if you still had a stock'ish exhaust, however mine was built from scratch same with most people here, so it needed something to use in the more every-day "cheap" way.

but ya if you really want to go the cut out way, get a electric cut-out and rock that, way more sleeper and great for the track specially if you put it right after the header.

you can find electric cut-outs even cheaper if you ebay around

 

Do you think I would have to put these into the header or could I put them after the presilencers on my RB street port system? Kinda sucks I would have to buy 2 of them. I wonder if there is a price difference for the 2 disc ones vs the 3 disc. Anyone know the inner diameter of piping for the RB dual exhaust system? I think this would be totally worth the money if it doesnt hinder much power while killing the insane amounts of noise that my car makes.

 

Umm Peejay came up with a simpler thing back in January. We were at the shop putting in his new driveshaft (he needed me to sit in the car and hold the brakes since his ebrake doesn't hold for ****).

Anyway he had a pipe reducer. IT was a 1 1/2 to 2 1/4 pipe (IIRC, don't quote me). He put some wire wool around the smaller end and then shoved it up his tailpipe. He used a hose clamp and clamped it on and it cut the noise level in half. Only 5 bucks, too.

 

The price is for each! So what I was thinking is that place it in a single pipe after the header. I have a road race type header as well, and the pipes seem a little short for the 7 inch long inserts.

Also to make up for the little power loss, I was thinking of rather than a 2.5 inch exhaust all the way back, a 3 inch. To give the .02 inch surface area backpressure that I would lose with that exhaust setup I would just throw one of these in there. Theoretically it would work and quiet the system down.

I got the .02 inch surface area by the math that my header has two 2 inch pipes and the surface area of the circle of the pipes is 2.8 combined.

Hopefully some more experienced exhaust gurus can chime in on this. Its all theory and I haven't tested **** out yet.