thats what made the whistle noise. 
Broken DT headers flex pipe
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Mine makes some weird noises too, especially when warming up. It also sounds like hell when going back into 8cyl. mode. Makes a rattle noise from under the car, kind of sounds like a rod rattling.
Launching!
Joined: Oct 2009
Posts: 291
Likes: 1
From: Toronto, Canada
Same here. Had my E cutout welded up at a performance shop and he had a quick look at it with a few of the mechanics and said he thought it was an air intake issue where the engine is wanting more air. I've got a k/n (fwi) and stage 2 intake mani and only get the noise at wot or throttle bursts. He suggested taking the k/n off and do a quick run up the road.
Thread Starter
TECH Fanatic
iTrader: (5)
Joined: Jul 2008
Posts: 1,467
Likes: 0
From: Yellowknife NT Canada
Guys Honestly, I have no clue why they put a flex pipe between the heads over the trans. There's no flex in that area it doesn't make any sense at all. The only place it should've been was at the end of the down pipe. Cause thats where the flex is. I haven't installed my headers yet but after reading about this noise I'm thinking of removing that flex pipe and welding it solid and adding a flex down below. Unless DT offers a cross over to fix the breaking and the whislte issue.