X-Pipe Lab

Compression
Rarefaction

Amber is compression. Teal is rarefaction (scavenge pull). Space pauses · N steps one fire · D dyno to 8,500 then idle · G five-speed. Sound stays at real rpm while waves crawl.

345 hp +0

Stock LS1 · personal best 345 hp

LS1 5.7 dyno

345hp

351 lb-ft @ 3,500 · peak @ 5,600 rpm

+0 vs stock

Stock LS1

Best 345 hp

hp torque stock 345 hp

Beat 345 hp. Long-tubes, an X, and an open tail are the usual path. 180° headers are the hidden extra.

Presets

Headers

Crossover

True duals: each bank isolated. Potato-potato idle, lumpy at cruise.

Cat-back length9.0 ft

Short is less backpressure. Long helps low-end, costs the top.

Mufflers

Crank

LS1 is cross-plane: banks fire L-R-R-L-R-L-L-R. Duals lope. 180° headers even the collectors.

Engine speed1,100 rpm

Slow-mo0.6%

Waves last milliseconds. Crawl speed lets you watch a pulse cross. Sound stays at real rpm.

Dyno sweeps to 8,500 then lifts to idle. 5-speed launches in 1st — each gear takes longer, the top of the pull sounds strained, then it drops back home.

What you are seeing

True-dual lope

Cross-plane Chevy order 1-8-4-3-6-5-7-2 hits banks L-R-R-L-R-L-L-R. Stacked pairs (8-4 and 5-7) are the potato-potato. Straight duals keep each bank isolated — that's the American muscle idle. Swap to an X and the lope fills in.

Scavenge

Backpressure

Evenness

Amber blobs are compression leaving a cylinder. Teal is rarefaction — the suction that scavenges the next overlap. Teaching model: linearized acoustics on a 1-D pipe graph, hot-gas speed of sound 520 m/s, LS1 5.7 torque table. Not CFD.