Speedway Lake-Style Header Collector Muffler Inserts, 4 Inch

Perfect for my headers

Fit in my headers perfectly

i would buy these mufflers again.

took a little tweaking because of the headers I have, but fit nice and tight.

They cut some noise. Can be improved.

I use these on a 454 rat rod. I don't know what brand my headers are but I had to grind off some excess welds on the inside of my headers but then the baffles fit perfect. They were still loud with the baffles but a bit less obnoxious than fully open. The included wrap was just token and inadequate. I added another layer of wrap and reinforced with a wire wrap. This cut some more noise and is tolerable now. Good enough for the street.

Will not fit a 4 inch header collector!!

It looks like its pretty good quality and I assume it fits speedways lake headers, but it will not fit other 4 inch collectors, which sucks because we wanted some baffles for our drag car to deadin the noise a little for tuning it, but these are to big! So they won't work.

Yes, I would buy it again.

Haven't completely finished the restoration but it fits perfectly.

Buy again if cheaper

Good Product but as usual for Speedway, expensive and high shipping cost.

product was good

did the job

I would consider buying this product again.

The mufflers slipped into the megaphone headers without any difficulty, but the sound was not modified to my satisfaction.

I would buy this again

I used them in my 4" lake style headers works great

Really knocks the sound down

Used these on a 31 Ford with a SBC with open side exit headers. Really helped. I chose not to used the fiberglass and that didn't seem to matter.