nwsurfrider

Hi All -

Noob here, and just getting started on the first few upgrades for my '84 Z/28 L69.

My question is, is there anyone out there who makes pre-fab straight-through 3" dual split pipes from shorty headers back? I've seen the Sinister, the Dynomax, etc. and so far haven't seen any true direct-fit, straight dual split pipes. Before I start fabricating my own, thought I'd check for the easier solution first with the group. Thanks for any and all feedback.

xch3no2

You may rescind your thanks but I implore you not to do this thing you speak of. It is not a legitimate upgrade. I know of no manufacture foolish enough to market such a product.

Dakota W.

Buy some headers, magnaflow X-pipe, and make sure you run it all the way under the car to the rear bumper, and no bigger than 3" pipe, if you go any bigger on the pipe size or don't go to the rear bumper you will have noticeble low end torque loss.

nwsurfrider

I understand the obvious smog and legal implications, but the former is negated due to the fact the car is in a county that doesn't have any current smog restrictions. The latter, well, that's still an issue but something I'm willing to deal with. So my question becomes how is it not legitimate? Frowned upon, perhaps, but I see the "for off-road use only" warning on many, many products.

built91Z28

Dual 3" pipes is WAY too much for a stock 305. I'm running dual 2.5" pipes on a 400 horse 357. The car will sound like junk and it'll probably feel slower than now. Just do shorty headers, a pre fabbed Y-pipe, and a 2.5" single pipe cat back. Easier and you'll thank yourself when it sounds and performs decent.

nwsurfrider

Good feedback. The exhaust upgrade is in anticipation for a 350 block to be installed into the car later this summer. If need be, I can hold off installing the exhaust until the bigger block is in - I just wanted it to be able to breath once the new block is in, and the current exhaust has a leak.

xch3no2

Because the long, independent tubes lack beneficial - nay - required IMO, pulse tuning.

nwsurfrider

Also good feedback, and I appreciate it. Something I didn't consider was the exhaust pressure in the pipe. So will an X-pipe help with the exhaust scavenging enough to solve the problem?